Prof. Kishan Dholakia Profile

Prof. Kishan Dholakia

Professor at Univ of Adelaide

SPIE Involvement:

Publications (174)

Proceedings Article | 3 October 2024 Presentation

Optical tweezers for microrheology of the cumulus matrix in a microlitre volume

Chris Perrella, Carl Campugan, Tania Mendonca, Cheow Tan, Megan Lim, Erik Schartner, Yoshihiko Arita, Graham Bruce, Amanda Wright, Kishan Dholakia, Kylie Dunning

Proceedings Volume PC13112, PC131120V (2024) https://doi.org/10.1117/12.3027394

KEYWORDS: Matrices, Viscosity, Optical tweezers, In vitro testing, Time metrology, Silica, Reflection, Particles, In vivo imaging, Beam diameter

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Proceedings Article | 3 October 2024 Presentation

Geometric interpretation of radiation pressure

Alexander Trowbridge, Kishan Dholakia

Proceedings Volume PC13112, PC1311210 (2024) https://doi.org/10.1117/12.3028637

KEYWORDS: Plane waves, Structured light, Phase shifts, Particles, Laser radiation, Chemical species, Angular momentum, Radio propagation, Photons, Optical manipulation

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Proceedings Article | 13 March 2024 Presentation

Spatially offset OCT: leveraging multiple scattering for enhanced contrast deep in biological tissues

Gavrielle Untracht, Freja Høier, Philip Wijesinghe, Harold Yura, Kishan Dholakia, Peter Andersen

Proceedings Volume PC12830, PC128300G (2024) https://doi.org/10.1117/12.3005420

KEYWORDS: Optical coherence tomography, Tissues, Multiple scattering, Biomedical optics, Microscopy, Image segmentation, Image contrast enhancement, Speckle, Signal attenuation, Scattered light

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Proceedings Article | 13 March 2024 Presentation

Measuring picometre-level displacements using speckle patterns generated by an integrating sphere

Morgan Facchin, Graham Bruce, Kishan Dholakia

Proceedings Volume PC12901, PC1290108 (2024) https://doi.org/10.1117/12.3002080

KEYWORDS: Speckle pattern, Integrating spheres, Speckle, Signal to noise ratio, Semiconductors, Reflection, Precision measurement, Polarization, Photonics, Optical semiconductors

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Proceedings Article | 13 March 2024 Presentation

Resolving the hyperfine structure of rubidium with a speckle spectrometer

Chris Perrella, Gabriel Britto Monteiro, Erik Schartner, Sarah Scholten, Morgan Facchin, Andre Luiten, Graham Bruce, Kishan Dholakia

Proceedings Volume PC12901, PC1290107 (2024) https://doi.org/10.1117/12.2692765

KEYWORDS: Spectroscopy, Speckle, Speckle pattern, Rubidium, Matrices, Optical transmission, Visible radiation, Transform theory, Spectral resolution, Principal component analysis

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Proceedings Article | 13 March 2024 Presentation

Non-invasive assessment of the developmental potential of embryos using digital holographic microscopy

Kylie Dunning, Darren Chow, George Dwapanyin, Tiffany Tan, Nicolas Dubost, Josephine Morizet, Kishan Dholakia

Proceedings Volume PC12854, PC128540V (2024) https://doi.org/10.1117/12.3001273

KEYWORDS: Digital holography, Refractive index, Microscopy, Holography, Holograms, Fetus, Diagnostics, Biopsy

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Proceedings Article | 5 October 2023 Presentation

All in a spin: rotational levitated optomechanics

Kishan Dholakia

Proceedings Volume PC12649, PC126490J (2023) https://doi.org/10.1117/12.2684150

KEYWORDS: Optomechanical design, Vacuum, Quantum particles, Quantum limits, Quantum ground state, Optical spheres, Optical coherence, Optical binding, Nanoparticles, Thermography

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Proceedings Article | 5 October 2023 Presentation

Exploiting resonances for enhanced optical trapping

Graham Bruce, Kishan Dholakia

Proceedings Volume PC12649, PC126491C (2023) https://doi.org/10.1117/12.2682752

KEYWORDS: Optical tweezers

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Proceedings Article | 4 October 2023 Open Access

Rotational levitated optomechanics with birefringent particles

Kishan Dholakia

Proceedings Volume 12746, 1274607 (2023) https://doi.org/10.1117/12.2690324

KEYWORDS: Quantum particles, Particles, Optomechanical design, Vacuum, Optical tweezers, Angular momentum, Viscosity, Quantum systems

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Proceedings Article | 11 August 2023 Paper

Enhanced contrast in optical coherence tomography using multiple scattering

Gavrielle Untracht, Mingzhou Chen, Philip Wijesinghe, Joesp Mas, Harold Yura, Dominik Marti, Peter Andersen, Kishan Dholakia

Proceedings Volume 12632, 126321G (2023) https://doi.org/10.1117/12.2670209

KEYWORDS: Optical coherence tomography, Multiple scattering, Signal attenuation, Microscopy, Image contrast enhancement, Biomedical optics, Scattered light, Optical microscopy, Interference (communication), Image enhancement

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Proceedings Article | 17 March 2023 Presentation

Sympathetic cooling and asymmetric interactions in optical binding

Graham Bruce, Yoshihiko Arita, XiaoYong Duan, Ewan Wright, Stephen Simpson, Pavel Zemánek, Kishan Dholakia

Proceedings Volume PC12436, PC124360Q (2023) https://doi.org/10.1117/12.2650232

KEYWORDS: Optical binding, Particles, Physics, Optical spheres, Modeling, Magnetism, Liquids

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Proceedings Article | 17 March 2023 Presentation

High sensitivity speckle metrology

Morgan Facchin, Kishan Dholakia, Graham Bruce

Proceedings Volume PC12436, PC124360B (2023) https://doi.org/10.1117/12.2650217

KEYWORDS: Speckle metrology, Speckle, Photonics, Light scattering, Scattering, Laser scattering, Environmental sensing, Speckle pattern, Refractive index, Polarization

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Proceedings Article | 15 March 2023 Presentation

Full-wave modelling of two-photon microscopy with spatiotemporal focusing (Conference Presentation)

Philip Wijesinghe, Kishan Dholakia, Peter R. Munro

Proceedings Volume PC12384, PC123840S (2023) https://doi.org/10.1117/12.2650046

KEYWORDS: Two photon excitation microscopy, Modeling, Scattering media, Multiphoton microscopy, Microscopy, Wave propagation, Speckle, Pulsed laser operation, Point spread functions, Performance modeling

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Proceedings Article | 9 March 2023 Presentation

Through the looking glass: Raman spectroscopy of concealed samples in sealed containers using shaped laser light

Graham Bruce, Georgina Shillito, Lewis McMillan, George Dwapanyin, Mingzhou Chen, Kishan Dholakia

Proceedings Volume PC12428, PC1242807 (2023) https://doi.org/10.1117/12.2649738

KEYWORDS: Raman spectroscopy, Glasses, Statistical analysis, Chemical analysis, Visualization, Visual analytics, Opacity, Nondestructive evaluation, Magnetic resonance imaging, Light scattering

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Proceedings Article | 3 October 2022 Presentation + Paper

Multiplexed near-field optical trapping

D. Conteduca, G. Brunetti, G. Pitruzzello, K. Dholakia, T. Krauss, C. Ciminelli

Proceedings Volume 12198, 1219803 (2022) https://doi.org/10.1117/12.2636025

KEYWORDS: Dielectrics, Multiplexing, Plasmonics, Optical tweezers, Particles, Near field optics, Resonance enhancement, Near field, Biomedical optics, Nanoantennas

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Proceedings Article | 3 October 2022 Presentation

Optical trapping in a material world

Kishan Dholakia

Proceedings Volume PC12198, PC121980G (2022) https://doi.org/10.1117/12.2635788

KEYWORDS: Optical tweezers, Particles, Near field, Nanostructuring, Liquids

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Proceedings Article | 3 October 2022 Presentation

Nonconservative levitated optomechanics

Yoshihiko Arita, Stephen Simpson, Graham Bruce, Pavel Zemánek, Kishan Dholakia

Proceedings Volume PC12198, PC121980Y (2022) https://doi.org/10.1117/12.2635918

KEYWORDS: Optomechanical design, Particles, Optical tweezers, Stochastic processes, Sensors, Anisotropy

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SPIE Journal Paper | 4 August 2022 Open Access

Meshless Monte Carlo radiation transfer method for curved geometries using signed distance functions

Lewis McMillan, Graham Bruce, Kishan Dholakia

JBO, Vol. 27, Issue 08, 083003, (August 2022) https://doi.org/10.1117/12.10.1117/1.JBO.27.8.083003

KEYWORDS: Monte Carlo methods, Optical spheres, Systems modeling, Scattering, Refractive index, Photon transport, Data modeling, Optical properties, Glasses, Absorption

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Proceedings Article | 9 March 2022 Presentation

Wavelength sensitivity of the speckle patterns produced by an integrating sphere

Morgan Facchin, Graham Bruce, Kishan Dholakia

Proceedings Volume PC12017, PC120170M (2022) https://doi.org/10.1117/12.2608676

KEYWORDS: Speckle pattern, Integrating spheres, Speckle, Speckle metrology, Reflectivity, Physics, Photonics, Optical spheres, Optical fibers, Integrated optics

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Proceedings Article | 5 March 2022 Presentation

Optimizing laser speckle production and analysis for high precision metrology

Morgan Facchin, Graham Bruce, Laura O'Donnell, Kishan Dholakia

Proceedings Volume PC12008, PC1200806 (2022) https://doi.org/10.1117/12.2608144

KEYWORDS: Metrology, Speckle, Laser metrology, Speckle pattern, Scattering, Refractive index, Principal component analysis, Polarization, Physics, Photonics

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Proceedings Article | 1 August 2021 Presentation

Parametric feedback cooling of a rotating birefringent microsphere in a vacuum optical trap

Yoshihiko Arita, Stephen Simpson, Graham Bruce, Pavel Zemánek, Kishan Dholakia

Proceedings Volume 11798, 117980X (2021) https://doi.org/10.1117/12.2598892

KEYWORDS: Optical tweezers, Particles, Stochastic processes, Silica, Optical spheres, Anisotropy

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SPIE Journal Paper | 7 July 2021 Open Access

Optical manipulation: advances for biophotonics in the 21st century

Stella Corsetti, Kishan Dholakia

JBO, Vol. 26, Issue 07, 070602, (July 2021) https://doi.org/10.1117/12.10.1117/1.JBO.26.7.070602

KEYWORDS: Optical tweezers, Particles, Biomedical optics, Proteins, Molecules, Optical manipulation, Acoustics, Near field optics, Plasmonics, Microfluidics

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Proceedings Article | 20 June 2021 Presentation

Shaping the future of biomedical imaging

Kishan Dholakia

Proceedings Volume 11786, 1178617 (2021) https://doi.org/10.1117/12.2596036

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Proceedings Article | 5 March 2021 Presentation

BPM-Matlab: an open-source optical propagation simulation tool in MATLAB

Madhu Veettikazhy, Anders Hansen, Dominik Marti, Stefan Jensen, Anja Borre, Esben Andresen, Kishan Dholakia, Peter Andersen

Proceedings Volume 11635, 1163508 (2021) https://doi.org/10.1117/12.2582547

KEYWORDS: Beam propagation method, Optical fibers, Optical simulations, MATLAB, Geometrical optics, Refractive index, Computer simulations, Optical communications, Numerical simulations, Multimode fibers

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Proceedings Article | 5 March 2021 Presentation

All in a spin: rotational dynamics of vacuum trapped microparticles

Kishan Dholakia

Proceedings Volume 11701, 1170118 (2021) https://doi.org/10.1117/12.2583026

KEYWORDS: Particles, Thermography, Stochastic processes, Sensors, Physics, Optomechanical design, Optical binding, Interfaces

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Proceedings Article | 22 August 2020 Presentation

Coherent oscillations of an optically levitated birefringent microsphere in vacuum

Yoshihiko Arita, Stephen Simpson, Pavel Zemánek, Kishan Dholakia

Proceedings Volume 11463, 114631W (2020) https://doi.org/10.1117/12.2570854

KEYWORDS: Particles, Optical tweezers, Oscillators, Thermography, Optical spheres, Anisotropy, Sensors

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Proceedings Article | 22 August 2020 Presentation

Deep learning for microscopy and measurement

Phillip Wijesinghe, Kishan Dholakia

Proceedings Volume 11463, 114631I (2020) https://doi.org/10.1117/12.2571320

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Proceedings Article | 15 June 2020 Paper

Coherent oscillations of a birefringent microsphere in vacuum optical traps

Yoshihiko Arita, Stephen Simpson, Pavel Zemánek, Kishan Dholakia

Proceedings Volume 11522, 115221C (2020) https://doi.org/10.1117/12.2573530

KEYWORDS: Optical tweezers, Particles, Oscillators, Optical spheres, Physics, Birefringence, Crystals, Silica, Polarization, Astronomy

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SPIE Journal Paper | 18 March 2020 Open Access

Twisted mass transport enabled by the angular momentum of light

Takashige Omatsu, Keigo Masuda, Katsuhiko Miyamoto, Kohei Toyoda, Natalia Litchinitser, Yoshihiko Arita, Kishan Dholakia

JNP, Vol. 14, Issue 01, 010901, (March 2020) https://doi.org/10.1117/12.10.1117/1.JNP.14.010901

KEYWORDS: Optical vortices, Amplitude modulation, Polarization, Near field optics, Near field, Gaussian beams, Gold, Wavefronts, Absorption, Silicon

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Proceedings Article | 10 March 2020 Presentation

High throughput label-free optical hemogram of granulocytes enhanced by artificial neural networks (Conference Presentation)

Roopam Gupta, Mingzhou Chen, Graeme Malcolm, Nils Hempler, Kishan Dholakia, Simon Powis

Proceedings Volume 11250, 112500X (2020) https://doi.org/10.1117/12.2544563

KEYWORDS: Artificial neural networks, Principal component analysis, Raman spectroscopy, Digital holography, Inflammation, Molecules, Flow cytometry, Magnetism, Holography, Microscopy

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Proceedings Article | 9 March 2020 Presentation

Imaging the airy way: Advanced beam shaping for light-sheet microscopy at depth (Conference Presentation)

Madhu Veettikazhy, Jonathan Nylk, Federico Gasparoli, Adrià Escobet-Montalbán, Anders Hansen, Dominik Marti, Peter Andersen, Kishan Dholakia

Proceedings Volume 11245, 112450J (2020) https://doi.org/10.1117/12.2544205

KEYWORDS: Microscopy, Optical filtering, Tissue optics, Beam shaping, Signal attenuation, Light scattering, Scattering, Absorption, Aberration correction, Gold

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Proceedings Article | 24 February 2020 Presentation + Paper

Non-conservative instabilities in optical vacuum traps

V. Svak, Y. Arita, S. Simpson, O. Brzobohatý, M. Šiler, P. Jákl, J. Kaňka, P. Zemánek, K. Dholakia

Proceedings Volume 11297, 112970F (2020) https://doi.org/10.1117/12.2545948

KEYWORDS: Particles, Optical spheres, Polarization, Gaussian beams, Thermography, Optical tweezers, Spherical lenses, Free space optics, Astronomical imaging, Physics

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Proceedings Article | 17 February 2020 Presentation + Paper

Numerical comparison of robustness of shaped beam delivery through multimode and multicore fibre against fibre bending

Madhu Veettikazhy, Anders Hansen, Dominik Marti, Kishan Dholakia, Peter Andersen

Proceedings Volume 11248, 112480U (2020) https://doi.org/10.1117/12.2542830

KEYWORDS: Optical fibers, Multimode fibers, Beam delivery, Structured optical fibers, Beam propagation method, Endoscopes, Tissue optics, Beam shaping, Numerical simulations, Computer simulations

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Proceedings Article | 30 December 2019 Paper

New perspectives for biomedical imaging at depth

Kishan Dholakia

Proceedings Volume 11202, 1120203 (2019) https://doi.org/10.1117/12.2551299

KEYWORDS: Biomedical optics, Scattering media, Multiphoton microscopy, Microscopy, Wavefronts, Sensors, Tissues, Beam shaping, Imaging systems, Physics

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Proceedings Article | 10 September 2019 Presentation

Generation of centi-meter scale twisted polymer fiber by high-order Bessel beam irradiation (Conference Presentation)

Junhyung Lee, Yoshihiko Arita, Reimon Matsuo, Haruki Kawaguchi, Katsuhiko Miyamoto, Kishan Dholakia, Takashige Omatsu

Proceedings Volume 11098, 1109809 (2019) https://doi.org/10.1117/12.2529055

KEYWORDS: Optical vortices, Picosecond phenomena, Polymers, Spiral phase plates, Wavefronts, Silicon, Metals, Ultraviolet radiation, Photopolymerization, Waveguides

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Proceedings Article | 9 September 2019 Presentation

Characterization and control of the external and internal temperature of an optically trapped particle (Conference Presentation)

Paloma Rodriguez Sevilla, Yoshihiko Arita, Xiaogang Liu, Daniel Jaque, Kishan Dholakia

Proceedings Volume 11083, 1108318 (2019) https://doi.org/10.1117/12.2528490

KEYWORDS: Particles, Temperature metrology, Cell mechanics, Quantum mechanics, Optomechanical design, Luminescence, Thermometry

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Proceedings Article | 9 September 2019 Presentation

Photopolymerization with light fields possessing orbital angular momentum (Conference Presentation)

Yoshihiko Arita, Junhyung Lee, Katsuhiko Miyamoto, Paris Panagiotopoulos, Ewan Wright, Kishan Dholakia, Takashige Omatsu

Proceedings Volume 11083, 1108320 (2019) https://doi.org/10.1117/12.2530249

KEYWORDS: Photopolymerization, Nonlinear optics, Ultraviolet radiation, Polymerization, Diffraction, Wavefronts, Optical fibers, Modulation, Solitons, Numerical simulations

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Proceedings Article | 4 March 2019 Presentation

Single- and multi-photon shaped illumination for light-sheet fluorescence microscopy (Conference Presentation)

Jonathan Nylk, Adrià Escobet-Montalbán, Pengfei Liu, Federico Gasparoli, Kaley McCluskey, Miguel Preciado, Michael Mazilu, Zhengyi Yang, Frank Gunn-Moore, Sanya Aggarwal, Javier Tello, David E. Ferrier, Kishan Dholakia

Proceedings Volume 10883, 1088319 (2019) https://doi.org/10.1117/12.2509353

KEYWORDS: Multiphoton microscopy, Microscopy, Luminescence, Multiphoton fluorescence microscopy, Light scattering, Tissues, Beam propagation method, Light wave propagation, Image quality, Bessel beams

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Proceedings Article | 4 March 2019 Presentation

Spatially offset optical coherence tomography (Conference Presentation)

Mingzhou Chen, Phillip Wijesinghe, Josep Mas, Kishan Dholakia

Proceedings Volume 10890, 1089017 (2019) https://doi.org/10.1117/12.2508356

KEYWORDS: Optical coherence tomography, Speckle, Photons, Image contrast enhancement, Coherence (optics), Signal detection, Scattering, Image enhancement, Image quality

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Proceedings Article | 22 February 2019 Presentation + Paper

Wide-field multiphoton imaging with TRAFIX

Adrià Escobet-Montalbán, Philip Wijesinghe, Mingzhou Chen, Kishan Dholakia

Proceedings Volume 10882, 108821G (2019) https://doi.org/10.1117/12.2508373

KEYWORDS: Multiphoton fluorescence microscopy, Multiphoton microscopy, Two photon excitation microscopy, Two photon imaging, Scattering, Compressed sensing, Scattering media, Microscopy, Microscopes, Luminescence, Objectives, Light scattering, Laser scattering, Spatial light modulators

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Proceedings Article | 17 September 2018 Presentation

Helical microfibers created by photopolymerization with light fields possessing orbital angular momentum (Conference Presentation)

Yoshihiko Arita, Junhyung Lee, Shunsuke Toyoshima, Katsuhiko Miyamoto, Paris Panagiotopoulos, Ewan Wright, Kishan Dholakia, Takashige Omatsu

Proceedings Volume 10723, 1072324 (2018) https://doi.org/10.1117/12.2323222

KEYWORDS: Photopolymerization, Ultraviolet radiation, Wavefronts, Optical vortices, Polymerization, Diffraction, Optical manipulation, Micro optics, Polymers, Crystallography

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Proceedings Article | 24 April 2018 Paper

Sub-millimeter helical fiber created by Bessel vortex beam illumination

JunHyung Lee, Yoshihiko Arita, Reimon Matsuo, Shunsuke Toyoshima, Katsuhiko Miyamoto, Kishan Dholakia, Takashige Omatsu

Proceedings Volume 10712, 107120J (2018) https://doi.org/10.1117/12.2319353

KEYWORDS: Bessel beams, Polymers, Optical vortices, Polymer multimode waveguides, Polymer optical fibers, Waveguides, Ultraviolet radiation, Photorefractive polymers, Scientific research, Illumination engineering

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Proceedings Article | 14 March 2018 Presentation

Optical trapping and heating of ultrasmooth gold nanoparticles in liquid and air (Conference Presentation)

Yoshihiko Arita, Georgiy Tkachenko, Naomi McReynolds, Nicolas Marro, William Edwards, Euan Kay, Kishan Dholakia

Proceedings Volume 10549, 105491G (2018) https://doi.org/10.1117/12.2290598

KEYWORDS: Gold, Nanoparticles, Optical tweezers, Optomechanical design, Liquids, Plasmonics, Optical manipulation, Optical binding, Particles, Surface plasmons

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Proceedings Article | 14 March 2018 Presentation

Levitated optomechanics of silica microparticles in vacuum placed in 2D and 3D optical potentials possessing orbital angular momentum (Conference Presentation)

Yoshihiko Arita, Michael Mazilu, Mingzhou Chen, Tom Vettenburg, Juan Aunon, Ewan Wright, Kishan Dholakia

Proceedings Volume 10549, 105491B (2018) https://doi.org/10.1117/12.2290534

KEYWORDS: Particles, Optomechanical design, Silica, Fourier transforms, Bessel beams, Beam propagation method, 3D image processing, Laser scattering, Scattering, Optical tracking

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Proceedings Article | 14 March 2018 Presentation

Generation of helical microfibers by photopolymerization of UV curing resins through light fields possessing orbital angular momentum (Conference Presentation)

Yoshihiko Arita, Junhyung Lee, Shunsuke Toyoshima, Katsuhiko Miyamoto, Kishan Dholakia, Takashige Omatsu

Proceedings Volume 10549, 1054917 (2018) https://doi.org/10.1117/12.2290479

KEYWORDS: Photopolymerization, Ultraviolet radiation, Waveguides, Polymer multimode waveguides, Polymers, Structured optical fibers, Structured light, Waveguide lasers, Polymerization, Diffraction

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Proceedings Article | 14 March 2018 Presentation

A femtometer-resolved all-fiber speckle wavemeter (Conference Presentation)

Graham Bruce, Mingzhou Chen, Kishan Dholakia

Proceedings Volume 10549, 105490N (2018) https://doi.org/10.1117/12.2289636

KEYWORDS: Speckle, Chemical species, Speckle pattern, Laser stabilization, Principal component analysis, Speckle metrology, Optical metrology, Prisms, Integrating spheres, Spectrometers

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Proceedings Article | 25 August 2017 Paper

A biophotonics platform based on optical trapping of photonic membranes

Blair Kirkpatrick, Tomas Čižmár, Kishan Dholakia, Andrea Di Falco

Proceedings Volume 10347, 103472P (2017) https://doi.org/10.1117/12.2277184

KEYWORDS: Biomedical optics, Optical tweezers, Optical manipulation, Surface enhanced Raman spectroscopy, Holography, Optical design, Control systems, Robotics, Optical sorting, Lab on a chip

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Proceedings Article | 2 June 2017 Presentation

Optical spectroscopic analysis for the discrimination of extra-virgin olive-oil (Conference Presentation)

Naomi McReynolds, Juan Auñón Garcia, Zoe Guengerich, Terry Smith, Kishan Dholakia

Proceedings Volume 10116, 101160K (2017) https://doi.org/10.1117/12.2250554

KEYWORDS: Raman spectroscopy, Fluorescence spectroscopy, Free space optics, Optical spectroscopy, Spectroscopes, Luminescence, Spectroscopy, Oxidation, Microopto electromechanical systems, Current controlled current source

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Proceedings Article | 28 April 2017 Presentation

A compact optical fibre trap based on a GRIN microlens and a principal component analysis algorithm for trap characterization in noisy environments (Conference Presentation)

Jonathan Nylk, Martin V. Kristensen, Michael Mazilu, Anisha Thayil, Claire Mitchell, Elaine Campbell, Simon Powis, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 10120, 1012012 (2017) https://doi.org/10.1117/12.2251991

KEYWORDS: Multiphoton microscopy, Principal component analysis, Image filtering, Optical fibers, Imaging systems, GRIN lenses, Optical manipulation, Microscopes, Microlens, Integrated optics

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Proceedings Article | 24 April 2017 Presentation

Generation of light-sheet at the end of multimode fibre (Conference Presentation)

Martin Plöschner, Véra Kollárová, Zbyněk Dostál, Jonathan Nylk, Thomas Barton-Owen, David E. Ferrier, Radim Chmelik, Kishan Dholakia, Tomáš Cizmár

Proceedings Volume 10073, 1007305 (2017) https://doi.org/10.1117/12.2250694

KEYWORDS: Tissue optics, Tissues, Microscopy, Multimode fibers, Endoscopy, Holography, Imaging systems, Luminescence, Biology, 3D image processing

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Proceedings Article | 24 April 2017 Presentation

New depths for Airy light-sheet microscopy: attenuation compensation techniques to increase imaging depths within absorbing samples (Conference Presentation)

Jonathan Nylk, Miguel Preciado, Michael Mazilu, Kishan Dholakia

Proceedings Volume 10073, 1007306 (2017) https://doi.org/10.1117/12.2251934

KEYWORDS: Image resolution, Gaussian beams, Microscopy, Wavefronts, Signal attenuation, Luminescence, Absorption, Beam propagation method, Amplitude modulation, Medical research

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Proceedings Article | 19 April 2017 Presentation

Combining Raman spectroscopy and digital holographic microscopy for label-free classification of human immune cells (Conference Presentation)

Naomi McReynolds, Fiona G. Cooke, Mingzhou Chen, Simon Powis, Kishan Dholakia

Proceedings Volume 10057, 100570A (2017) https://doi.org/10.1117/12.2250505

KEYWORDS: Holography, Microscopy, Chemical analysis, Clinical research, Nondestructive evaluation, Physics, Astronomy, Medicine, Raman spectroscopy, Digital holography

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Proceedings Article | 18 April 2017 Paper

Wavefront correction enables vibrational imaging of bacteria with multimode fibre probes

Ivan Gusachenko, Mingzhou Chen, Kishan Dholakia

Proceedings Volume 10251, 1025104 (2017) https://doi.org/10.1117/12.2274974

KEYWORDS: Raman spectroscopy, Wavefronts, Multimode fibers, Bacteria, Spatial light modulators, Endoscopy, Imaging spectroscopy, Microscopy, Light scattering, Biomedical optics

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Proceedings Article | 18 April 2017 Paper

Rotational dynamics and heating of trapped nanovaterite particles

Yoshihiko Arita, Joseph Richards, Michael Mazilu, Gabriel Spalding, Susan Skelton Spesyvtseva, Derek Craig, Kishan Dholakia

Proceedings Volume 10252, 102520S (2017) https://doi.org/10.1117/12.2275291

KEYWORDS: Birefringence, Optical tweezers, Photothermal effect, Absorption, Crystals, Motion models, Nanoparticles, Finite element methods, Systems modeling, Optomechanical design, Physics, Astronomy

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Proceedings Article | 18 April 2017 Paper

Twisted polymeric microfiber formed by structured light illumination

Junhyung Lee, Shunsuke Toyoshima, Katsuhiko Miyamoto, Yoshihiko Arita, Kishan Dholakia, Takashige Omatsu

Proceedings Volume 10252, 102520K (2017) https://doi.org/10.1117/12.2274919

KEYWORDS: Ultraviolet radiation, Polymer optical fibers, Structured optical fibers, Structured light, Continuous wave operation, Glasses, Spiral phase plates, Optical manipulation, Polymers, Photopolymerization, Optical vortices, Singular optics, Microfabrication

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Proceedings Article | 18 April 2017 Paper

Optical binding of two microparticles levitated in vacuum

Yoshihiko Arita, Ewan Wright, Kishan Dholakia

Proceedings Volume 10252, 102520Q (2017) https://doi.org/10.1117/12.2275310

KEYWORDS: Particles, Light scattering, Astronomical imaging, Integrated optics, Modulation, In situ metrology, Physics, Astronomy, Molecular interactions, Optical binding, Optical tweezers

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Proceedings Article | 18 April 2017 Paper

Dynamics of optically levitated microparticles in vacuum placed in 2D and 3D optical potentials possessing orbital angular momentum

Yoshihiko Arita, Michael Mazilu, Mingzhou Chen, Tom Vettenburg, Juan Auñón, Ewan Wright, Kishan Dholakia

Proceedings Volume 10252, 102520V (2017) https://doi.org/10.1117/12.2275309

KEYWORDS: Particles, Astronomical imaging, Integrated optics, Fourier transforms, Bessel beams, 3D image processing, Silica, Laser scattering, Scattering, Optical tracking, Optical tweezers

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We demonstrate the transfer of orbital angular momentum to optically levitated microparticles in vacuum [1]. We prepare two-dimensional and three-dimensional optical potentials. In the former case the microparticle is placed within a Laguerre-Gaussian beam and orbits the annular beam profile with increasing angular velocity as the air drag coefficient is reduced. We explore the particle dynamics as a function of the topological charge of the levitating beam. Our results reveal that there is a fundamental limit to the orbital angular momentum that may be transferred to a trapped particle, dependent upon the beam parameters and inertial forces present. This effect was predicted theoretically [2] and can be understood considering the underlying dynamics arising from the link between the magnitude of the azimuthal index and the beam radius [3]. Whilst a Laguerre-Gaussian beam scales in size with azimuthal index `, recently we have created a “perfect” vortex beam whose radial intensity profile and radius are both independent of topological charge [4, 5]. As the Fourier transform of a perfect vortex yields a Bessel beam. Imaging a perfect vortex, with its subsequent propagation thus realises a complex three dimensional optical field. In this scenario we load individual silica microparticles into this field and observe their trajectories. The optical gradient and scattering forces interplay with the inertial and gravitational forces acting on the trapped particle, including the rotational degrees of freedom. As a result the trapped microparticle exhibits a complex three dimensional motion that includes a periodic orbital motion between the Bessel and the perfect vortex beam. We are able to determine the three dimensional optical potential in situ by tracking the particle. This first demonstration of trapping microparticles within a complex three dimensional optical potential in vacuum opens up new possibilities for fundamental studies of many-body dynamics, mesoscopic entanglement [6, 7], and optical binding [8, 9].

Proceedings Article | 17 February 2017 Paper

Probing neural tissue with airy light-sheet microscopy: investigation of imaging performance at depth within turbid media

Jonathan Nylk, Kaley McCluskey, Sanya Aggarwal, Javier Tello, Kishan Dholakia

Proceedings Volume 10070, 100700B (2017) https://doi.org/10.1117/12.2251921

KEYWORDS: Tissues, Microscopy, Tissue optics, Visualization, Beam propagation method, Deconvolution, Biomedical optics, 3D image processing, Image resolution, LIDAR, Image quality, Brain, Biological research, Point spread functions

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Proceedings Article | 14 February 2017 Presentation + Paper

Structured illumination microscopy as a diagnostic tool for nephrotic disease

Jonathan Nylk, James Pullman, Elaine Campbell, Frank Gunn-Moore, Michael Prystowsky, Kishan Dholakia

Proceedings Volume 10054, 1005417 (2017) https://doi.org/10.1117/12.2252004

KEYWORDS: Microscopy, Kidney, Diagnostics, Pathology, Nephrology, Super resolution, Transmission electron microscopy, Tissue optics, Visualization, Biopsy, 3D image processing

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Proceedings Article | 8 February 2017 Presentation + Paper

Rapid imaging of mammalian brain slices with a compact light sheet fluorescent microscope

Zhengyi Yang, Peter Haslehurst, Suzanne Scott, Nigel Emptage, Kishan Dholakia

Proceedings Volume 10051, 100510T (2017) https://doi.org/10.1117/12.2251227

KEYWORDS: Brain, Neuroscience, Neuroimaging, Microscopy, Photolysis, Neurons, Spine, Microscopes, Calcium, Dendrites, Temporal resolution

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Proceedings Article | 10 November 2016 Presentation

Rotational dynamics and heating of trapped nanovaterite particles (Conference Presentation)

Yoshihiko Arita, Joseph Richards, Michael Mazilu, Gabriel Spalding, Susan Skelton Spesyvtseva, Derek Craig, Kishan Dholakia

Proceedings Volume 9922, 99222B (2016) https://doi.org/10.1117/12.2239993

KEYWORDS: Particles, Crystals, Liquids, Optomechanical design, Optical tweezers, Optical testing, Dielectrics, Crystallography, Absorption, Silica

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Proceedings Article | 10 November 2016 Presentation

Can integer and fractional optical vortices produce equally smooth optical manipulation? (Conference Presentation)

Georgiy Tkachenko, Mingzhou Chen, Kishan Dholakia, Michael Mazilu

Proceedings Volume 9922, 99220Q (2016) https://doi.org/10.1117/12.2239408

KEYWORDS: Optical vortices, Quantization, Wavefronts, Particles, Optical manipulation, Wave propagation, Spiral phase plates, Optical tweezers, Optical micromanipulation, Current controlled current source

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Proceedings Article | 25 August 2015 Paper

Integrated 3D macro-trapping and light-sheet imaging system

Zhengyi Yang, Peeter Piksarv, David Ferrier, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 9548, 95480T (2015) https://doi.org/10.1117/12.2186399

KEYWORDS: Imaging systems, Optical tweezers, Objectives, Mirrors, 3D image processing, Microscopy, Microscopes, Biological research, Confocal microscopy, Image resolution

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Proceedings Article | 10 March 2015 Paper

Fibre-based imaging: new challenges

Martin Plöschner, Branislav Straka, Kishan Dholakia, Tomáš Čižmár

Proceedings Volume 9335, 93350H (2015) https://doi.org/10.1117/12.2077693

KEYWORDS: Spatial light modulators, Holograms, Charge-coupled devices, Superposition, Polarization, Physics, Standards development, Computing systems, Control systems, Acousto-optics

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Proceedings Article | 16 September 2014 Paper

Optical trapping with a perfect vortex beam

Mingzhou Chen, Michael Mazilu, Yoshihiko Arita, Ewan Wright, Kishan Dholakia

Proceedings Volume 9164, 91640K (2014) https://doi.org/10.1117/12.2064080

KEYWORDS: Particles, Spatial light modulators, Optical tweezers, Wavefronts, Microscopes, Video, Molybdenum, Polymers, Chemical species, Gases

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Proceedings Article | 12 March 2014 Paper

Wavefront shaping of a Bessel light field enhances light sheet microscopy with scattered light

J. Nylk, C. Mitchell, T. Vettenburg, F. Gunn-Moore, K. Dholakia

Proceedings Volume 8949, 89490V (2014) https://doi.org/10.1117/12.2038525

KEYWORDS: Luminescence, Light scattering, Microscopy, Bessel beams, Scattering, Microscopes, Image acquisition, Image resolution, Wavefronts, Spatial light modulators

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Proceedings Article | 7 March 2014 Paper

Femtosecond optical injection of intact plant cells using a reconfigurable platform

Claire Mitchell, Stefan Kalies, Tomas Cizmar, Nicola Bellini, Anisha Kubasik-Thayil, Alexander Heisterkamp, Lesley Torrance, Alison Roberts, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 8972, 89720C (2014) https://doi.org/10.1117/12.2037784

KEYWORDS: Bessel beams, Femtosecond phenomena, Gaussian beams, Pulsed laser operation, Molecules, Luminescence, Biomedical optics, Laser beam propagation, Microscopes, Laser optics

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Proceedings Article | 7 March 2014 Paper

Single cell transfection by laser-induced breakdown of an optically trapped gold nanoparticle

Yoshihiko Arita, Martin Ploschner, Maciej Antkowiak, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 8972, 897203 (2014) https://doi.org/10.1117/12.2039647

KEYWORDS: Nanoparticles, Gold, Laser induced breakdown spectroscopy, Cavitation, Laser induced damage, Liquids, Pulsed laser operation, Particles, Optical tweezers, Continuous wave operation

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Proceedings Article | 4 March 2014 Paper

Label-free haemogram using wavelength modulated Raman spectroscopy for identifying immune-cell subset

Praveen Ashok, Bavishna Praveen, Elaine Campbell, Kishan Dholakia, Simon Powis

Proceedings Volume 8939, 893907 (2014) https://doi.org/10.1117/12.2039836

KEYWORDS: Raman spectroscopy, Blood, Modulation, Principal component analysis, Binary data, Confocal microscopy, Pathogens, Feature selection, Luminescence, Lymphatic system

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Proceedings Article | 4 March 2014 Paper

Combined information from Raman spectroscopy and optical coherence tomography for enhanced diagnostic accuracy in tissue discrimination

Praveen Ashok, Bavishna Praveen, Nicola Bellini, Andrew Riches, Kishan Dholakia, C. Simon Herrington

Proceedings Volume 8939, 89390L (2014) https://doi.org/10.1117/12.2039855

KEYWORDS: Raman spectroscopy, Optical coherence tomography, Tissues, Tissue optics, Cancer, Diagnostics, Colorectal cancer, Colon, Biopsy, Spectroscopy

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Proceedings Article | 27 February 2014 Paper

Development of a fiber based Raman probe compatible with interventional magnetic resonance imaging

Praveen Ashok, Bavishna Praveen, Martin Rube, Benjamin Cox, Andreas Melzer, Kishan Dholakia

Proceedings Volume 8935, 89351J (2014) https://doi.org/10.1117/12.2039805

KEYWORDS: Raman spectroscopy, Head, Magnetic resonance imaging, Optical filters, Tissues, Biopsy, Tissue optics, In vivo imaging, Luminescence, Spectroscopy

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Proceedings Article | 26 February 2014 Paper

Imaging the cellular response to transient shear stress using time-resolved digital holography

Yoshihiko Arita, Maciej Antkowiak, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 8946, 89460V (2014) https://doi.org/10.1117/12.2039973

KEYWORDS: Cavitation, Laser induced breakdown spectroscopy, Nanoparticles, Digital holography, Microscopy, Laser induced damage, Pulsed laser operation, Plasma, Holograms, Laser interferometry

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Proceedings Article | 25 February 2014 Paper

Combining focusing properties of a single diatom valve with optical eigenmodes in ultra-shrinking of light

L. Lavanga, E. De Tommasi, A. De Luca, P. Dardano, M. De Stefano, L. De Stefano, I. Rendina, K. Dholakia, M. Mazilu

Proceedings Volume 8999, 899916 (2014) https://doi.org/10.1117/12.2039488

KEYWORDS: Polarization, Ocean optics, Spatial light modulators, Numerical simulations, Laser beam diagnostics, Coherence imaging, Light, Diffraction, Silica, Superposition

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Proceedings Article | 22 March 2013 Paper

Exploiting multimode waveguides for pure fibre based fluorescence imaging

Tomáš Čižmár, Kishan Dholakia

Proceedings Volume 8572, 85720S (2013) https://doi.org/10.1117/12.2003798

KEYWORDS: Microscopy, Geometrical optics, Waveguides, Gradient-index optics, Image resolution, Spatial light modulators, Light wave propagation, Spiral phase plates, Imaging systems, Endoscopes

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Proceedings Article | 15 March 2013 Paper

High-throughput optical injection of mammalian cells using a non-diffracting beam in a microfluidic platform

Helen Rendall, Robert Marchington, Bavishna Praveen, Gerald Bergmann, Yoshihiko Arita, Alexander Heisterkamp, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 8611, 861103 (2013) https://doi.org/10.1117/12.2003193

KEYWORDS: Microfluidics, Bessel beams, Femtosecond phenomena, Electroluminescence, Biomedical optics, Neodymium, Capillaries, Nondiffracting beams, Digital image correlation, Astronomical imaging

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Proceedings Article | 15 March 2013 Paper

Femtosecond optical transfection as a tool for genetic manipulation of human embryonic stem cells

M. L. Torres-Mapa, J. Gardner, H. Bradburn, J. King, K. Dholakia, F. Gunn-Moore

Proceedings Volume 8611, 861104 (2013) https://doi.org/10.1117/12.2003739

KEYWORDS: Stem cells, Femtosecond phenomena, Genetics, Spatial light modulators, Mirrors, Glasses, Control systems, Biomedical optics, Plating, Proteins

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Proceedings Article | 5 March 2013 Paper

The role of propagation invariant light modes in single and multi-photon imaging

T. Vettenburg, H. Dalgarno, T. Čižmár, K. Dholakia

Proceedings Volume 8637, 86370I (2013) https://doi.org/10.1117/12.2003881

KEYWORDS: Bessel beams, Microscopy, Beam propagation method, Objectives, Luminescence, Modulation transfer functions, Image resolution, Light wave propagation, Microscopes, Confocal microscopy

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Proceedings Article | 5 March 2013 Paper

Optical manipulation, beam-shaping and scanner-free bright-ﬁeld and dark-ﬁeld imaging via multimode optical ﬁbre

Tomáš Čižmár, Kishan Dholakia

Proceedings Volume 8637, 86370G (2013) https://doi.org/10.1117/12.2003820

KEYWORDS: Geometrical optics, Electroluminescent displays, Spatial light modulators, Polarization, Imaging systems, Particles, Calibration, Holograms, Optical manipulation, Charge-coupled devices

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Proceedings Article | 22 February 2013 Paper

Increasing the resolution of light sheet microscopy in the presence of aberrations

T. Vettenburg, H. Dalgarno, T. Čižmár, F. Gunn-Moore, K. Dholakia

Proceedings Volume 8589, 858912 (2013) https://doi.org/10.1117/12.2003828

KEYWORDS: Microscopy, Objectives, Aberration correction, Tissue optics, Microscopes, 3D image processing, Luminescence, Charge-coupled devices, Fluorescence spectroscopy, Laser beam diagnostics

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Proceedings Article | 17 October 2012 Paper

Theory and simulation of an optical spring mirror

E. M. Wright, M. Mazilu, S. Singh, K. Dholakia, P. Meystre

Proceedings Volume 8458, 84580A (2012) https://doi.org/10.1117/12.929281

KEYWORDS: Mirrors, Gaussian beams, Dielectric mirrors, Silica, Optical tweezers, Optical simulations, Dielectrics, Waveguides, Reflectivity, Reflection

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Proceedings Article | 10 October 2012 Paper

The role of spectral bandwidth in transverse optical binding

Michael Mazilu, Andrew Rudhall, Ewan Wright, Kishan Dholakia

Proceedings Volume 8458, 84583D (2012) https://doi.org/10.1117/12.930920

KEYWORDS: Optical binding, Particles, Polarization, Optical tweezers, Ultrafast phenomena, Astronomical imaging, Harmonic generation, Physics, Scattering

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Proceedings Article | 10 October 2012 Paper

Resonance enhanced optical manipulation: the push and pull of light

Michael Mazilu, Kishan Dholakia

Proceedings Volume 8458, 845809 (2012) https://doi.org/10.1117/12.930404

KEYWORDS: Laser scattering, Scattering, Free space optics, Resonance enhancement, Free space, Optical manipulation, Electromagnetism, Light-matter interactions, Optical micromanipulation, Beam shaping

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Proceedings Article | 10 October 2012 Paper

Multimode fibre as a light mode convertor: principles and applications

Tomáš Čižmár, Kishan Dholakia

Proceedings Volume 8458, 845820 (2012) https://doi.org/10.1117/12.928947

KEYWORDS: Polarization, Spatial light modulators, Geometrical optics, Electroluminescent displays, Charge-coupled devices, Optical tweezers, Objectives, Particles, Holography, Biomedical optics

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Proceedings Article | 10 October 2012 Paper

Optical sorting of gold nanoparticles based on the red-shift of plasmon resonance

Martin Ploschner, Tomáš Čižmar, Michael Mazilu, Andrea Di Falco, Kishan Dholakia

Proceedings Volume 8458, 84581L (2012) https://doi.org/10.1117/12.928482

KEYWORDS: Nanoparticles, Gold, Particles, Plasmons, Optical sorting, Interfaces, Scattering, Laser scattering, Charge-coupled devices, Surface enhanced Raman spectroscopy

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SPIE Journal Paper | 9 July 2012 Open Access

Fluorescence suppression using wavelength modulated Raman spectroscopy in fiber-probe-based tissue analysis

Bavishna Praveen, Praveen Ashok, Michael Mazilu, Kishan Dholakia, Andrew Riches, Simon Herrington

JBO, Vol. 17, Issue 7, 077006, (July 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.7.077006

KEYWORDS: Raman spectroscopy, Luminescence, Tissues, Modulation, Signal to noise ratio, Bone, Tissue optics, Principal component analysis, Spectroscopy, Chemical analysis

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SPIE Journal Paper | 15 May 2012 Open Access

Tissue surface as the reference arm in Fourier domain optical coherence tomography

Nikola Krstajic, Christian Brown, Kishan Dholakia, Mario Giardini

JBO, Vol. 17, Issue 7, 071305, (May 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.7.071305

KEYWORDS: Optical coherence tomography, Natural surfaces, Skin, Tissues, Tissue optics, Charge-coupled devices, Reflectivity, Reflection, Image processing, Aluminum

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Proceedings Article | 8 May 2012 Paper

A multimodal holographic system for optical manipulation and injection of developing embryos

Maria Leilani Torres-Mapa, Maciej Antkowiak, Hana Cizmarova, David E.K. Ferrier, Kishan Dholakia, Frank Gunn-Moore

Proceedings Volume 8427, 84273D (2012) https://doi.org/10.1117/12.922509

KEYWORDS: Spatial light modulators, Holography, Optical manipulation, Genetics, Ocean optics, Laser optics, Optical tweezers, Biology, Femtosecond phenomena, Visualization

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Proceedings Article | 8 May 2012 Paper

Towards gene therapy based on femtosecond optical transfection

M. Antkowiak, M. Torres-Mapa, J. McGinty, M. Chahine, L. Bugeon, A. Rose, A. Finn, S. Moleirinho, K. Okuse, M. Dallman, P. French, S. Harding, P. Reynolds, F. Gunn-Moore, K. Dholakia

Proceedings Volume 8427, 84270R (2012) https://doi.org/10.1117/12.922835

KEYWORDS: Neurons, Femtosecond phenomena, In vivo imaging, Luminescence, Objectives, Tissues, Heart, Laser optics, Medicine, Plasma

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Proceedings Article | 11 February 2012 Paper

Optical eigenmodes for imaging applications

Sebastian Kosmeier, Michael Mazilu, Anna Chiara De Luca, Jörg Baumgartl, Kishan Dholakia

Proceedings Volume 8274, 82740I (2012) https://doi.org/10.1117/12.912058

KEYWORDS: Spatial light modulators, Bessel beams, Optical imaging, Superposition, Diffraction, Confocal microscopy, Beam splitters, Charge-coupled devices, Imaging systems, Raster graphics

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Proceedings Article | 1 February 2012 Paper

Raman spectra of single cells with autofluorescence suppression by modulated wavelength excitation

Christoph Krafft, Sebastian Dochow, Norbert Bergner, Joachim Clement, Bavishna Praveen, Michael Mazilu, Rob Marchington, Kishan Dholakia, Jürgen Popp

Proceedings Volume 8219, 82190F (2012) https://doi.org/10.1117/12.908564

KEYWORDS: Raman spectroscopy, Modulation, Optical tweezers, Microfluidics, Tumors, Principal component analysis, Proteins, Blood, Biomedical optics, Glasses

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SPIE Journal Paper | 1 December 2011 Open Access

Imaging the cellular response to transient shear stress using stroboscopic digital holography

Maciej Antkowiak, Yoshihiko Arita, Kishan Dholakia, Frank Gunn-Moore

JBO, Vol. 16, Issue 12, 120508, (December 2011) https://doi.org/10.1117/12.10.1117/1.3665441

KEYWORDS: Cavitation, Laser induced breakdown spectroscopy, Nanoparticles, Digital holography, Laser induced damage, Video, Microscopy, Plasma, Holograms, Pulsed laser operation

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Proceedings Article | 9 September 2011 Paper

Femtosecond laser pulses for chemical-free embryonic and mesenchymal stem cell differentiation

Patience Mthunzi, Kishan Dholakia, Frank Gunn-Moore

Proceedings Volume 8097, 809723 (2011) https://doi.org/10.1117/12.893572

KEYWORDS: Stem cells, Femtosecond phenomena, Objectives, Therapeutics, Genetics, Lenses, Acquisition tracking and pointing, Aluminium phosphide, In vitro testing, Laser induced fluorescence

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Proceedings Article | 24 August 2011 Paper

Fabrication of polymer microlens at the apex of optical fiber

Nan Ma, Praveen Ashok, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 8173, 817314 (2011) https://doi.org/10.1117/12.899114

KEYWORDS: Microlens, Adhesives, Optical fibers, Ultraviolet radiation, Polymers, Polymer optical fibers, Beam shaping, Structured optical fibers, Fabrication, Axicons

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Proceedings Article | 23 August 2011 Paper

Enhancement of the efficiency of femtosecond optical transfection

Bavishna Praveen, David Stevenson, Maciej Antkowiak, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 8173, 817307 (2011) https://doi.org/10.1117/12.899117

KEYWORDS: Femtosecond phenomena, Ovary, Microfluidics, Tissue optics, Biology, Fluorescent proteins, Laser optics, Photonics, Optical tweezers, Astronomical imaging

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SPIE Journal Paper | 1 March 2011 Open Access

Modulated Raman spectroscopy for enhanced identification of bladder tumor cells in urine samples

Elisabetta Canetta, Michael Mazilu, Anna De Luca, Antonia Carruthers, Kishan Dholakia, Sam Neilson, Harry Sargeant, Tina Briscoe, C. Simon Herrington, Andrew Riches

JBO, Vol. 16, Issue 03, 037002, (March 2011) https://doi.org/10.1117/12.10.1117/1.3556722

KEYWORDS: Raman spectroscopy, Modulation, Bladder cancer, Principal component analysis, Tumors, Bladder, Luminescence, Cancer, Statistical analysis, Spectroscopy

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Proceedings Article | 17 February 2011 Paper

Optical sculpting: trapping through disorder and transfer of orbital angular momentum

T. Cižmár, M. Mazilu, H. Dalgarno, P. Ashok, F. Gunn-Moore, K. Dholakia

Proceedings Volume 7950, 79500R (2011) https://doi.org/10.1117/12.876357

KEYWORDS: Particles, Optical tweezers, Spatial light modulators, Superposition, Modulation, Microscopes, Holography, Scattering, Adaptive optics, Spiral phase plates

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Proceedings Article | 11 February 2011 Paper

Towards high-throughput automated targeted femtosecond laser-based transfection of adherent cells

Maciej Antkowiak, Maria Leilani Torres-Mapa, Frank Gunn-Moore, Kishan Dholakia

Proceedings Volume 7925, 79250B (2011) https://doi.org/10.1117/12.874645

KEYWORDS: Spatial light modulators, Objectives, Femtosecond phenomena, Raster graphics, Imaging systems, Lenses, 3D acquisition, Microscopes, Mirrors, Toxicity

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SPIE Journal Paper | 1 February 2011 Open Access

Optical transfection using an endoscope-like system

Nan Ma, Kishan Dholakia, Frank Gunn-Moore

JBO, Vol. 16, Issue 02, 028002, (February 2011) https://doi.org/10.1117/12.10.1117/1.3541781

KEYWORDS: Imaging systems, Axicons, Biomedical optics, Tissue optics, Optical fibers, System integration, Cladding, Pulsed laser operation, Free space optics, Objectives

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Proceedings Article | 15 December 2010 Paper

Flexible dual-beam geometry for advanced optical micromanipulation experiments

Oto Brzobohatý, Tomáš Čižmár, Kishan Dholakia, Pavel Zemánek

Proceedings Volume 7746, 77461C (2010) https://doi.org/10.1117/12.882124

KEYWORDS: Particles, Spatial light modulators, Gaussian beams, Phase shift keying, Optical tweezers, Computing systems, Visualization, Microfluidics, Human-machine interfaces, Spatial filters

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Proceedings Article | 28 August 2010 Paper

Formation of one-dimensional optically bound structures of polystyrene particles near the surface

Oto Brzobohatý, Vítězslav Karásek, Pavel Zemánek, Tomáš Čižmár, Kishan Dholakia

Proceedings Volume 7762, 776212 (2010) https://doi.org/10.1117/12.860364

KEYWORDS: Particles, Mirrors, Optical binding, Optical tweezers, Gaussian beams, Code division multiplexing, Optical testing, Astronomical imaging, Glasses, Objectives

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Proceedings Article | 28 August 2010 Paper

In situ wavefront optimization: towards the ideal performance of a biophotonics system

Tomáš Cižmár, Michael Mazilu, Kishan Dholakia

Proceedings Volume 7762, 776228 (2010) https://doi.org/10.1117/12.862755

KEYWORDS: Spatial light modulators, Optical tweezers, Wavefronts, Adaptive optics, Objectives, Particles, Phase shift keying, Wavefront distortions, Modulation, Biomedical optics

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Proceedings Article | 28 August 2010 Paper

Determination of optical forces in the proximity of a nanoantenna

Martin Ploschner, Michael Mazilu, Thomas Krauss, Kishan Dholakia

Proceedings Volume 7762, 77620L (2010) https://doi.org/10.1117/12.861474

KEYWORDS: Particles, Optical spheres, Antennas, Nanostructures, Plasmonics, Scattering, Optical tweezers, Plasmons, Dielectrics, Nanoantennas

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SPIE Journal Paper | 1 July 2010 Open Access

Phototransfection of mammalian cells using femtosecond laser pulses: optimization and applicability to stem cell differentiation

Patience Mthunzi, Kishan Dholakia, Frank Gunn-Moore

JBO, Vol. 15, Issue 04, 041507, (July 2010) https://doi.org/10.1117/12.10.1117/1.3430733

KEYWORDS: Stem cells, Femtosecond phenomena, Objectives, Tissue optics, Biology, Genetics, Tissues, Plasma, Physics, Biomedical optics

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SPIE Journal Paper | 1 July 2010 Open Access

Transient transfection of mammalian cells using a violet diode laser

Maria Leilani Torre-Mapa, Liselotte Veldhuis, Martin Ploschner, Kishan Dholakia, Frank Gunn-Moore

JBO, Vol. 15, Issue 04, 041506, (July 2010) https://doi.org/10.1117/12.10.1117/1.3430730

KEYWORDS: Semiconductor lasers, Continuous wave operation, Absorption, Luminescence, Optical spheres, Diodes, Femtosecond phenomena, Proteins, Physics, Microscopes

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SPIE Journal Paper | 1 July 2010 Open Access

Light forces the pace: optical manipulation for biophotonics

David Stevenson, Frank Gunn-Moore, Kishan Dholakia

JBO, Vol. 15, Issue 04, 041503, (July 2010) https://doi.org/10.1117/12.10.1117/1.3475958

KEYWORDS: Optical tweezers, Particles, Molecules, Biomedical optics, Raman spectroscopy, Optical manipulation, Proteins, Optical spheres, Polymers, Refractive index

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Proceedings Article | 25 February 2010 Paper

Modulated Raman spectroscopy technique for real-time fluorescence rejection

Michael Mazilu, Anna Chiara De Luca, Andrew Riches, Simon Herrington, Kishan Dholakia

Proceedings Volume 7568, 75680M (2010) https://doi.org/10.1117/12.841675

KEYWORDS: Raman spectroscopy, Luminescence, Modulation, Signal to noise ratio, Polymers, Molecules, Molecular spectroscopy, Biological research, Optical filters, In vivo imaging

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Proceedings Article | 23 February 2010 Paper

Fluorescence-free biochemical characterization of cells using modulated Raman spectroscopy

Anna De Luca, Michael Mazilu, Andrew Riches, Simon Herrington, Kishan Dholakia

Proceedings Volume 7555, 755517 (2010) https://doi.org/10.1117/12.841686

KEYWORDS: Raman spectroscopy, Modulation, Luminescence, Principal component analysis, Biomedical optics, Spectroscopy, Charge-coupled devices, Biological research, Microscopes, Linear filtering

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SPIE Journal Paper | 1 February 2010

Optical forces near a nanoantenna

Martin Ploschner, Michael Mazilu, Thomas Krauss, Kishan Dholakia

JNP, Vol. 4, Issue 01, 041570, (February 2010) https://doi.org/10.1117/12.10.1117/1.3332850

KEYWORDS: Particles, Optical spheres, Antennas, Scattering, Nanostructures, Near field optics, Optical tweezers, Dielectrics, Optical properties, Nanoantennas

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Proceedings Article | 22 August 2009 Paper

Accelerating vortices in Airy beams

Michael Mazilu, Joerg Baumgartl, Tomas Čižmár, Kishan Dholakia

Proceedings Volume 7430, 74300C (2009) https://doi.org/10.1117/12.826372

KEYWORDS: Spatial light modulators, Beam propagation method, Spiral phase plates, Gaussian beams, Fourier transforms, Phase measurement, Physics, Nondiffracting beams, Wave propagation, Singular optics

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Proceedings Article | 22 August 2009 Paper

Supercontinuum Airy beams

Jill Morris, Michael Mazilu, Jörg Baumgartl, Tomáš Čižmár, Kishan Dholakia

Proceedings Volume 7430, 74300W (2009) https://doi.org/10.1117/12.826098

KEYWORDS: Spatial light modulators, Spatial coherence, Holograms, Wave propagation, Beam propagation method, Interference filters, Gaussian beams, Supercontinuum sources, Light wave propagation, Diffraction

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Proceedings Article | 20 August 2009 Paper

Axial intensity shaping of a Bessel beam

Tomáš Čižmár, Kishan Dholakia

Proceedings Volume 7400, 74001Q (2009) https://doi.org/10.1117/12.826297

KEYWORDS: Bessel beams, Axicons, Spatial frequencies, Beam propagation method, Fourier transforms, Gaussian beams, Diffraction, Free space, Optical tweezers, Spatial light modulators

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Proceedings Article | 20 August 2009 Paper

Revisiting transverse optical binding

Jörg Baumgartl, Andrew Rudhall, Michael Mazilu, Ewan Wright, Kishan Dholakia

Proceedings Volume 7400, 74001D (2009) https://doi.org/10.1117/12.826189

KEYWORDS: Particles, Optical binding, Polarization, Laser optics, Dielectrics, Optical tweezers, Water, Mirrors, Objectives, Physics

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Proceedings Article | 20 August 2009 Paper

Optical nonlinearity of liquid nanosuspensions: Kerr versus exponential model

E. Wright, W. Lee, K. Dholakia, R. El-Ganainy, D. Christodoulides

Proceedings Volume 7400, 74001J (2009) https://doi.org/10.1117/12.825865

KEYWORDS: Nanoparticles, Beam propagation method, Nonlinear optics, Rayleigh scattering, Particles, Single mode fibers, Liquids, Digital image correlation, Capillaries, Kerr effect

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Proceedings Article | 20 August 2009 Paper

Dielectric enhanced nanoparticles for three-dimensional optical manipulation

Woei Ming Lee, Jose Luis Hernández-Pozos, Liliana Irais Vera-Robles, Antonio Campero, Pascal Andre, Shu Chen, Kishan Dholakia

Proceedings Volume 7400, 740023 (2009) https://doi.org/10.1117/12.825456

KEYWORDS: Nanoparticles, Silica, Dielectrics, Optical tweezers, Optical spheres, Gold, Beam splitters, Semiconductors, Polymers, Coating

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Proceedings Article | 20 August 2009 Paper

Towards integrated optical chromatography using photonic crystal fiber

P. Ashok, R. Marchington, M. Mazilu, T. Krauss, K. Dholakia

Proceedings Volume 7400, 74000R (2009) https://doi.org/10.1117/12.825933

KEYWORDS: Particles, Chromatography, Geometrical optics, Microfluidics, Photonic crystal fibers, Free space optics, Dielectrics, Integrated optics, Refractive index, Channel projecting optics

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Proceedings Article | 20 August 2009 Paper

Optical "snowblowing" of microparticles and cells in a microfluidc environment using Airy and parabolic wavepackets

Jörg Baumgartl, Gregor Hannappel, David Stevenson, Michael Mazilu, Daniel Day, Min Gu, Kishan Dholakia

Proceedings Volume 7400, 74001R (2009) https://doi.org/10.1117/12.826193

KEYWORDS: Particles, Spatial light modulators, Modulation, Phase shift keying, Microscopes, Phase modulation, Objectives, Optical tweezers, Amplitude modulation, Optical micromanipulation

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Proceedings Article | 20 November 2008 Paper

One-dimensional long-range self-arranged optically bound structures

Oto Brzobohatý, Vítìzslav Karàsek, Tomáš Čižmár, Pavel Zemánek, Veneranda Garcés-Chávez, Kishan Dholakia

Proceedings Volume 7141, 714113 (2008) https://doi.org/10.1117/12.822384

KEYWORDS: Particles, Bessel beams, CCD cameras, Optical tweezers, Wavelets, Modulation, Axicons, Code division multiplexing, Optical binding, Beam propagation method

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Proceedings Article | 18 November 2008 Paper

Optically bound chain of microparticles

Pavel Zemánek, Oto Brzobohaty, Vítezslav Karásek, Tomás Cizmár, Veneranda Garcés-Chávez, Kishan Dholakia

Proceedings Volume 7138, 713825 (2008) https://doi.org/10.1117/12.818076

KEYWORDS: Particles, Bessel beams, Beam propagation method, Optical binding, Optical tweezers, Modulation, Code division multiplexing, Wavelets, Axicons, CCD cameras

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Proceedings Article | 17 September 2008 Paper

Polarisation distribution for internal conical diffraction and the superposition of zero and first order Bessel beams

D. O'Dwyer, C. Phelan, Y. Rakovich, T. Cizmar, K. Dholakia, J. Donegan, J. Lunney

Proceedings Volume 7062, 70620W (2008) https://doi.org/10.1117/12.804258

KEYWORDS: Polarization, Bessel beams, Geometrical optics, Crystals, Diffraction, Superposition, Refraction, Laser crystals, Beam propagation method, Gaussian beams

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Proceedings Article | 9 September 2008 Paper

Stability and dynamics of self-arranged structures in longitudinal optical binding

Oto Brzobohatý, Vítezslav Karásek, Tomáš Čižmár, Pavel Zemánek, Veneranda Garcés-Chávez, Kishan Dholakia

Proceedings Volume 7038, 70380O (2008) https://doi.org/10.1117/12.794681

KEYWORDS: Particles, Bessel beams, Optical binding, Beam propagation method, Optical tweezers, Wavelets, Modulation, Axicons, CCD cameras, Code division multiplexing

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SPIE Journal Paper | 1 September 2008 Open Access

Optical manipulation of nanoparticles: a review

Maria Dienerowitz, Michael Mazilu, Kishan Dholakia

JNP, Vol. 2, Issue 01, 021875, (September 2008) https://doi.org/10.1117/12.10.1117/1.2992045

KEYWORDS: Nanoparticles, Particles, Optical tweezers, Scattering, Objectives, Metals, Dielectrics, Molecules, Plasmons, Polarizability

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Proceedings Article | 29 August 2008 Paper

Novel dual beam fiber traps using endlessly single-mode photonic crystal fiber

David Gherardi, Antonia Carruthers, Tomáš Čižmár, Robert Marchington, Kishan Dholakia

Proceedings Volume 7038, 703828 (2008) https://doi.org/10.1117/12.794828

KEYWORDS: Particles, Optical spheres, Photonic crystal fibers, Capillaries, Scattering, Laser scattering, Optical micromanipulation, Supercontinuum sources, Light, Optical tweezers

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Proceedings Article | 29 August 2008 Paper

Generation and control of multiple Bessel beams for optical micromanipulation

T. Čižmár, V. Kollárová, X. Tsampoula, F. Gunn-Moore, Z. Bouchal, K. Dholakia

Proceedings Volume 7038, 70380Q (2008) https://doi.org/10.1117/12.794944

KEYWORDS: Bessel beams, Modulation, Phase shift keying, Axicons, Gaussian beams, Optical tweezers, Optical micromanipulation, Phase modulation, Particles, Linear filtering

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Proceedings Article | 29 August 2008 Paper

Long distance beam propagation in colloidal suspensions: comparison between theory and experiment

E. Wright, W. M. Lee, P.-L. Giscard, K. Dholakia

Proceedings Volume 7038, 70380P (2008) https://doi.org/10.1117/12.796243

KEYWORDS: Light scattering, Nanoparticles, Particles, Refractive index, Beam propagation method, Scattering, Laser scattering, Rayleigh scattering, Nonlinear optics, Gaussian beams

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Proceedings Article | 29 August 2008 Paper

Aerosol tweezing with a super-continuum laser beam

Marc Guillon, Kishan Dholakia, David McGloin

Proceedings Volume 7038, 70381Q (2008) https://doi.org/10.1117/12.793726

KEYWORDS: Raman scattering, Spectroscopy, Scattering, Light scattering, Optical tweezers, Microscopes, Aerosols, Geometrical optics, Laser scattering, Mie scattering

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Proceedings Article | 29 August 2008 Paper

Optical trapping using ultrashort 12.9fs pulses

Janelle Shane, Michael Mazilu, Woei Ming Lee, Kishan Dholakia

Proceedings Volume 7038, 70380Y (2008) https://doi.org/10.1117/12.795085

KEYWORDS: Particles, Dispersion, Optical tweezers, Microscopes, Pulsed laser operation, Ultrafast phenomena, Silica, Second-harmonic generation, Near field optics, Harmonic generation

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Proceedings Article | 20 February 2008 Paper

Femtosecond cellular transfection using a non-diffracting beam

X. Tsampoula, V. Garcés-Chávez, M. Comrie, D. Stevenson, B. Agate, C. T. Brown, F. Gunn-Moore, K. Dholakia

Proceedings Volume 6854, 68541L (2008) https://doi.org/10.1117/12.762677

KEYWORDS: Bessel beams, Gaussian beams, Femtosecond phenomena, Axicons, Beam propagation method, Tissues, Nondiffracting beams, Fluorescent proteins, Biomedical optics, Genetics

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Proceedings Article | 8 February 2008 Paper

Early identification of cervical neoplasia with Raman spectroscopy and advanced methods for biomedical applications

Phillip R. Jess, Daniel D. Smith, Michael Mazilu, Iain Cormack, Andrew Riches, C. Simon Herrington, Kishan Dholakia

Proceedings Volume 6853, 68530P (2008) https://doi.org/10.1117/12.767802

KEYWORDS: Raman spectroscopy, Principal component analysis, Luminescence, Beam shaping, Objectives, Proteins, Microscopes, Signal to noise ratio, Diagnostics, Biomedical optics

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Proceedings Article | 12 September 2007 Paper

Optical coherence measurements of vortex light fields using optically manipulated micro-apertures

W. Lee, K. Dholakia

Proceedings Volume 6644, 66440Y (2007) https://doi.org/10.1117/12.734131

KEYWORDS: Visibility, Calcite, Particles, Spatial coherence, Coherence (optics), Wavefronts, Diffusers, Optical tweezers, Wave propagation, Laser beam diagnostics

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SPIE Journal Paper | 1 September 2007 Open Access

Passive optical separation within a 'nondiffracting' light beam

Lynn Paterson, Eirini Papagiakoumou, G. Milne, Veneranda Garcés-Chávez, T. Briscoe, Wilson Sibbett, Kishan Dholakia, Andrew Riches

JBO, Vol. 12, Issue 05, 054017, (September 2007) https://doi.org/10.1117/12.10.1117/1.2794780

KEYWORDS: Bessel beams, Optical spheres, Refractive index, Bone, Silica, Stem cells, Capillaries, Particles, Fluorescence correlation spectroscopy, Microfluidics

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Proceedings Article | 11 April 2007 Paper

How to use laser radiative and evanescent interference fields to control movement of the sub-micron objects

Pavel Zemánek, Tomáš Čižmár, Martin Šiler, Veneranda Garcés-Chávez, Kishan Dholakia, Věra Kollárová, Zdeněk Bouchal

Proceedings Volume 6609, 660902 (2007) https://doi.org/10.1117/12.739338

KEYWORDS: Particles, Bessel beams, Optical tweezers, Gaussian beams, Mirrors, Wave propagation, Axicons, Nondiffracting beams, Polarization, Laser scattering

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Proceedings Article | 9 February 2007 Paper

Far field interference measurements of vortex light fields in optical trapping

W. Lee, A. Carruthers, V. Garcés-Chávez, K. Dholakia

Proceedings Volume 6483, 64830N (2007) https://doi.org/10.1117/12.702215

KEYWORDS: Optical vortices, Spiral phase plates, Optical tweezers, Particles, Spatial coherence, Wavefronts, Phase shifts, Light scattering, Far-field diffraction, Computer generated holography

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