Prof. Oleg Mitrofanov Profile

Prof. Oleg Mitrofanov

Associate Professor at Univ College London

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (34)

Proceedings Article | 6 October 2023 Presentation

All-dielectric metasurfaces for terahertz generation, detection, and manipulation

Hyunseung Jung, Lucy Hale, Jayson Briscoe, Ting Shan Luk, Sadhvikas Addamane, Igal Brener, Oleg Mitrofanov

Proceedings Volume PC12683, PC126830G (2023) https://doi.org/10.1117/12.2681515

KEYWORDS: Design and modelling, Dielectrics, Indium arsenide, Gallium arsenide, Terahertz radiation, Binary data, Zone plates, Ultrafast phenomena, Terahertz technology, Terahertz detection

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Proceedings Article | 4 October 2023 Presentation + Paper

Photoconductive metasurfaces for near-field terahertz sources and detectors

Lucy Hale, Hyunseung Jung, James Seddon, Raktim Sarma, Sylvain Gennaro, Jayson Briscoe, C. Thomas Harris, Ting Shan Luk, Prasad Iyer, Sadhvikas Addamane, John Reno, Igal Brener, Oleg Mitrofanov

Proceedings Volume 12683, 126830C (2023) https://doi.org/10.1117/12.2681721

KEYWORDS: Terahertz radiation, Near field, Near infrared, Microscopy, Terahertz detection, Spatial resolution, Terahertz sources, Near field optics, Signal detection, Electromagnetic metamaterials, Terahertz spectroscopy

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Proceedings Article | 4 October 2023 Presentation

Broadband ultrathin absorber for microbolometer applications

Ting Shan Luk, Guangping Xu, Willard Ross, John Nogan, Ethan Scott, Sergei Ivanov, Oana Niculescu, Oleg Mitrofanov, Charles Harris

Proceedings Volume PC12647, PC126471L (2023) https://doi.org/10.1117/12.2674202

KEYWORDS: Microbolometers, Film thickness, Resonance enhancement, Titanium, Tin, Microfabrication, Dielectrics, Bolometers, Absorption

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Proceedings Article | 4 October 2023 Presentation

Enhancing semiconductor quantum dot emission with electric and magnetic dipole modes in Mie metasurfaces

Samuel Prescott, Prasad Iyer, Hyunseung Jung, Ting Shan Luk, Jacob Henshaw, Andrew Mounce, Sadhvikas Addamane, Igal Brener, Oleg Mitrofanov

Proceedings Volume PC12646, PC1264615 (2023) https://doi.org/10.1117/12.2677377

KEYWORDS: Semiconductor quantum dots, Quantum dot emission, Quantum enhancement, Magnetism, Quantum dots, Quantum systems, Photoluminescence, Spectroscopy, Semiconductors, Resonators

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Proceedings Article | 12 June 2023 Presentation

Maximal absorption of ultrathin TiN absorber film for microbolometer applications (Conference Presentation)

Ting Shan Luk, Thomas Harris, Oleg Mitrofanov, Ethan Scott, Guangping Xu, Willard Ross, John Nogan, Sergei Ivanov, Oana Niculescu

Proceedings Volume 12536, 125360R (2023) https://doi.org/10.1117/12.2665978

KEYWORDS: Tin, Bolometers, Absorption, Microbolometers, Long wavelength infrared, Thermography, Sensors, Infrared sensors, Silicon, Sensor performance

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Proceedings Article | 1 August 2021 Presentation

Low power requirement photoconductive antenna detectors based on a perfectly absorbing metasurfaces

Lucy Hale, Charles Harris, Ting Shan Luk, Sadhvikas Addamane, John Reno, Igal Brener, Oleg Mitrofanov

Proceedings Volume 11827, 118270P (2021) https://doi.org/10.1117/12.2596140

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Proceedings Article | 1 August 2021 Presentation

Perfectly absorbing photoconductive metasurfaces for terahertz applications

Lucy Hale, Polina Vabishchevich, Charles Harris, Ting Shan Luk, Sadhvikas Addamane, John Reno, Igal Brener, Oleg Mitrofanov

Proceedings Volume 11795, 117951Z (2021) https://doi.org/10.1117/12.2596141

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Proceedings Article | 20 August 2020 Presentation + Paper

Near-field probing of strong light-matter coupling in single IR antennae

O. Mitrofanov, C.-F. Wang, T. Habteyes, T. S. Luk, J. Klem, I. Brener, H.-T. Chen

Proceedings Volume 11499, 114990A (2020) https://doi.org/10.1117/12.2568033

KEYWORDS: Antennas, Quantum wells, Polaritons, Near field, Nanoantennas, Spectroscopy, Microscopes, Quantum cascade lasers

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Proceedings Article | 20 August 2020 Poster + Paper

Terahertz aperture SNOM mapping of metamaterial coupled resonators

Nikita Almond, Rodolfo Hermans, Lucy Hale, Stephen Kindness, Wladislaw Michailow, Binbin Wei, Xavier Romain, Sheng Ye, Robert Young, Riccardo Degl'Innocenti, Harvey Beere, David Ritchie, Oleg Mitrofanov

Proceedings Volume 11460, 114601R (2020) https://doi.org/10.1117/12.2568045

KEYWORDS: Resonators, Terahertz radiation, Metamaterials, Near field scanning optical microscopy, Near field, Picosecond phenomena, Gold, Transparency, Silicon

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Proceedings Article | 9 September 2019 Presentation

Engineering perfect absorption in all-dielectric photoconductive metasurfaces (Conference Presentation)

Oleg Mitrofanov, Thomas Siday, Polina Vabishchevich, Lucy Hale, Thomas Harris, Ting Shan Luk, John Reno, Igal Brener

Proceedings Volume 11080, 110802Q (2019) https://doi.org/10.1117/12.2529419

KEYWORDS: Absorption, Resonators, Magnetism, Photonic devices, Optoelectronics, Switches, Sensors, Modulators, Gallium arsenide, Numerical simulations

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Proceedings Article | 6 September 2019 Presentation + Paper

Terahertz detectors based on all-dielectric photoconductive metasurfaces

Oleg Mitrofanov, Thomas Siday, Polina Vabishchevich, Lucy Hale, Charles Thomas Harris, Ting Shan Luk, John Reno, Igal Brener

Proceedings Volume 11124, 1112410 (2019) https://doi.org/10.1117/12.2529393

KEYWORDS: Terahertz radiation, Sensors, Absorption, Gallium arsenide, Photons, Resonators, Switching, Plasmonics, Millimeter wave sensors, Nanostructures

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Proceedings Article | 4 March 2019 Presentation

Improving efficiency of photoconductive terahertz detectors using all-dielectric optical metasurfaces (Conference Presentation)

Oleg Mitrofanov, Thomas Siday, Robert Thompson, Ting Shan Luk, Igal Brener, John Reno

Proceedings Volume 10922, 109220G (2019) https://doi.org/10.1117/12.2511142

KEYWORDS: Terahertz radiation, Sensors, Millimeter wave sensors, Near field optics, Plasmonics, Imaging spectroscopy, Switches, Nanostructures, Absorption, Channel projecting optics

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Detection of terahertz (THz) radiation with high sensitivity and efficiency remains a challenging problem for THz technology development. A photoconductive THz detector based on the Auston switch concept is among the most sensitive and widely-used room-temperature coherent THz detectors. Plasmonic nano-antennas and gratings, and ultrathin optical cavities recently were introduced in the structure of THz optoelectronic devices to improve their efficiencies. It allowed obtaining higher photocurrents and smaller capacitance, which lead to improvements in the response speed and efficiency of THz detectors. Plasmonic nanostructures however introduce Ohmic losses, which can substantially reduce the responsivity of THz detectors. Alternatively, efficiency of photoconductive THz detectors can be enhanced by using all-dielectric metasurfaces. A metasurface containing only dielectric, instead of plasmonic nanostructures, can be designed to trap the incident light in a selected spectral range and thus enhance optical absorption. We designed an optically-thin photoconductive channel as an all-dielectric metasurface, which exhibited enhanced optical absorption at laser excitation wavelength. The metasurface comprised an array of low-temperature grown GaAs nanobeams and a sub-surface distributed Bragg reflector. Integrated into a photoconductive (Auston) switch, the metasurface improved the efficiency and sensitivity of the THz detector. Specifically, the detector produced photocurrents over one order of magnitude higher compared to a similar detector with unstructured surface with only 0.5 mW of optical excitation, while exhibiting high dark resistance required for low-noise detection in THz time-domain spectroscopy and imaging. At that level of optical excitation the metasurface detector showed a high signal to noise ratio of 10^6. We will discuss mechanisms responsible for the efficiency improvement, as well as the application of THz detectors with all-dielectric metasurfaces for enabling more sensitive integrated THz near-field probes.

Proceedings Article | 18 September 2018 Presentation

Modelling the carrier dynamics of semiconductors to understand their terahertz emission (Conference Presentation)

Enrique Castro-Camus, Mariana Alfaro-Gomez, Sofia Corzo-Garcia, Arturo Hernandez-Serrano, Oleg Mitrofanov

Proceedings Volume 10756, 107560B (2018) https://doi.org/10.1117/12.2321155

KEYWORDS: Carrier dynamics, Semiconductors, Modeling, Monte Carlo methods, Near field, Indium arsenide, Indium gallium arsenide, Gallium arsenide, Ultrafast phenomena, Terahertz radiation

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Proceedings Article | 23 February 2018 Presentation + Paper

An efficient terahertz detector based on an optical hybrid cavity

Thomas Siday, Robert Thompson, Samuel Glass, Ting-Shan Luk, John Reno, Igal Brener, Oleg Mitrofanov

Proceedings Volume 10531, 1053109 (2018) https://doi.org/10.1117/12.2290971

KEYWORDS: Nanoantennas, Terahertz radiation, Reflectivity, Gallium arsenide, Absorption, Sensors, Hybrid optics, Cavity resonators, Photonic nanostructures

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Proceedings Article | 26 January 2018 Paper

Sub-wavelength near field imaging techniques at terahertz frequencies

Maria Caterina Giordano, Leonardo Viti, Oleg Mitrofanov, Gaetano Scamarcio, Stefan Mastel, Rainer Hillenbrand, Daniele Ercolani, Lucia Sorba, Miriam Vitiello

Proceedings Volume 10540, 105400N (2018) https://doi.org/10.1117/12.2291518

KEYWORDS: Terahertz radiation, Near field, Near field optics, Quantum cascade lasers, Signal detection, Sensors, Spatial resolution, Mirrors, Interferometry, Nanostructures

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Proceedings Article | 26 January 2018 Presentation + Paper

Resonant scattering probes for terahertz near-field microscopy

Tom Siday, Michele Natrella, Jiang Wu, Huiyun Liu, Oleg Mitrofanov

Proceedings Volume 10540, 1054020 (2018) https://doi.org/10.1117/12.2290903

KEYWORDS: Terahertz radiation, Scattering, Indium arsenide, Near field, Microscopy, Antennas, Near field scanning optical microscopy

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Proceedings Article | 29 September 2017 Presentation

Hybrid cavity for photo-conductive detectors with nanoantenna arrays and distributed Bragg reflectors (Conference Presentation)

Oleg Mitrofanov

Proceedings Volume 10353, 103530J (2017) https://doi.org/10.1117/12.2275566

KEYWORDS: Absorption, Sensors, Distributed Bragg reflectors, Imaging systems, Infrared sensors, Optical properties, Gallium arsenide, Photons, Optical sensors, Ultraviolet radiation

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Proceedings Article | 24 February 2017 Presentation + Paper

Mechanically robust cylindrical metal terahertz waveguides for cryogenic applications

Robert Wallis, Riccardo Degl'Innocenti, Oleg Mitrofanov, Joanna Waldie, Carlos Bledt, Jeffrey Melzer, James Harrington, Harvey Beere, David Ritchie

Proceedings Volume 10103, 1010307 (2017) https://doi.org/10.1117/12.2250530

KEYWORDS: Terahertz radiation, Waveguides, Cryogenics, Quantum cascade lasers, Metals, Copper, Picosecond phenomena, Aluminum, Thermography

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Proceedings Article | 27 January 2017 Presentation + Paper

Spectroscopy and mapping of resonant fields in terahertz plasmonic resonators

Oleg Mitrofanov, Zhanghua Han, Fei Ding, Sergey Bozhevolnyi, Igal Brener, John Reno

Proceedings Volume 10111, 101110R (2017) https://doi.org/10.1117/12.2254416

KEYWORDS: Resonators, Terahertz radiation, Plasmonics, Spectroscopy, Near field scanning optical microscopy, Near field, Microscopy, Picosecond phenomena, Signal detection, Antennas

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Proceedings Article | 13 February 2016 Paper

Plasmonic resonances in carbon fibers observed with terahertz near-field microscopy

Irina Khromova, Miguel Navarro-Cía, Igal Brener, John Reno, Andrey Ponomarev, Oleg Mitrofanov

Proceedings Volume 9755, 97550O (2016) https://doi.org/10.1117/12.2213349

KEYWORDS: Terahertz radiation, Carbon, Optical fibers, Plasmonics, Near field, Resonators, Spectroscopy, Dielectrics, Resonance enhancement, Microscopy

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Proceedings Article | 31 August 2015 Paper

Plasmonic enhancement of sensitivity in terahertz (THz) photo-conductive detectors

Oleg Mitrofanov, Ting Shan Luk, Igal Brener, John Reno

Proceedings Volume 9585, 95850N (2015) https://doi.org/10.1117/12.2188177

KEYWORDS: Terahertz radiation, Sensors, Gallium arsenide, Plasmonics, Near field optics, Near field, Spatial resolution, Antennas, Absorption, Electrodes

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Proceedings Article | 8 February 2015 Paper

Magnetic dipole and electric dipole resonances in TiO2 microspheres at terahertz frequencies

Oleg Mitrofanov, Filip Domenic, Petr Kužel, John Reno, Igal Brener, U-Chan Chung, Cathy Elissalde, Mario Maglione, Patrick Mounaix

Proceedings Volume 9370, 937005 (2015) https://doi.org/10.1117/12.2079734

KEYWORDS: Terahertz radiation, Optical spheres, Magnetism, Near field, Resonators, Metamaterials, Dielectrics, Picosecond phenomena, Resonance enhancement, Titanium dioxide

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Proceedings Article | 5 September 2014 Paper

Terahertz waveguides with low transmission losses: characterization and applications

Oleg Mitrofanov, Miguel Navarro-Cia, Miriam Vitiello, Jeffrey Melzer, James Harrington

Proceedings Volume 9199, 91990I (2014) https://doi.org/10.1117/12.2062758

KEYWORDS: Waveguides, Terahertz radiation, Dispersion, Absorption, Wave propagation, Dielectrics, Signal attenuation, Near field, Imaging spectroscopy, Spectroscopy

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Proceedings Article | 20 February 2014 Paper

Silver-coated Teflon hollow waveguides for the delivery of terahertz radiation

Jeffrey Melzer, Miguel Navarro-Cía, Oleg Mitrofanov, James Harrington

Proceedings Volume 8938, 89380I (2014) https://doi.org/10.1117/12.2041606

KEYWORDS: Waveguides, Terahertz radiation, Silver, Dielectrics, Metals, Absorbance, Spectroscopy, Signal attenuation, Refractive index, Etching

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Proceedings Article | 31 January 2014 Paper

Terahertz near-field probe incorporating a [lambda]/100 aperture for time-domain spectroscopy and imaging

Alexander Macfaden, John Reno, Igal Brener, Oleg Mitrofanov

Proceedings Volume 8993, 89931D (2014) https://doi.org/10.1117/12.2039364

KEYWORDS: Terahertz radiation, Near field, Spatial resolution, Sensors, Imaging spectroscopy, Antennas, Near field optics, Spectroscopy, Distributed Bragg reflectors, Photonic nanostructures

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Proceedings Article | 31 January 2014 Paper

Surface plasmon waves for broadband THz spectroscopy

O. Mitrofanov, M. Navarro-Cia, R. Mueckstein, M. Natrella, C. Graham, C. Renaud, A. Seeds, F. Dominec, P. Kužel, J. C. Delagnes, P. Mounaix

Proceedings Volume 8993, 89931B (2014) https://doi.org/10.1117/12.2029352

KEYWORDS: Terahertz radiation, Antennas, Spectroscopy, Near field, Particles, Imaging spectroscopy, Dielectrics, Optical spheres, Surface plasmons, Imaging systems

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Proceedings Article | 31 January 2014 Paper

THz near-field microscopy of graphene structures

Oleg Mitrofanov, Wenlong Yu, Robert Thompson, Yuxuan Jiang, Igal Brener, Wei Pan, Claire Berger, Walter de Heer, Zhigang Jiang

Proceedings Volume 8993, 89932A (2014) https://doi.org/10.1117/12.2041790

KEYWORDS: Graphene, Terahertz radiation, Near field, Plasmons, Microscopy, Surface plasmons, Silicon carbide, Polarization, Interfaces, Imaging spectroscopy

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Proceedings Article | 17 September 2011 Paper

Morphology of cleaved rubrene and its evolution in an ambient environment

R. Thompson, B. Yadin, Z. Grout, S. Hudziak, C. Kloc, N. Curson, O. Mitrofanov

Proceedings Volume 8117, 811712 (2011) https://doi.org/10.1117/12.893058

KEYWORDS: Crystals, Atomic force microscopy, Natural surfaces, Epoxies, Argon, Molecular electronics, Molecules, Spectroscopy, Crystallography, Oxidation

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Proceedings Article | 8 September 2011 Paper

Terahertz quantum cascade laser coupled with high efficiency to the low loss optical modes of cylindrical hollow-core waveguides

Miriam Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, James Harrington, H. Beere, D. Ritchie

Proceedings Volume 8119, 81190F (2011) https://doi.org/10.1117/12.899132

KEYWORDS: Waveguides, Terahertz radiation, Quantum cascade lasers, Wave propagation, Hollow waveguides, Microrings, Waveguide modes, Silver, Laser beam propagation, Metals

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Proceedings Article | 7 September 2011 Paper

Near-field imaging of terahertz plasmon waves with a subwavelength aperture probe

Oleg Mitrofanov, Raimund Mueckstein

Proceedings Volume 8096, 809605 (2011) https://doi.org/10.1117/12.893064

KEYWORDS: Terahertz radiation, Antennas, Surface plasmons, Near field, Signal detection, Plasmons, Sensors, Wave propagation, Plasmonics, Near field optics

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Proceedings Article | 27 August 2009 Paper

Photoluminescence-detected magnetic resonance (PLDMR) study of rubrene and oxygen-doped rubrene films and powders

Min Cai, Ying Chen, Joseph Shinar, Oleg Mitrofanov, Christian Kloc, Arthur Ramirez

Proceedings Volume 7415, 74151Y (2009) https://doi.org/10.1117/12.827277

KEYWORDS: Oxygen, Magnetism, Polarons, Tellurium, Selenium, Resonance enhancement, Excitons, Microwave radiation, Fusion energy, Luminescence

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Proceedings Article | 13 September 2007 Paper

Modification of charge transport in single crystal rubrene

Oleg Mitrofanov, D. Lang, T. Siegrist, W.-Y. So, C. Kloc, A. Ramirez

Proceedings Volume 6658, 66580G (2007) https://doi.org/10.1117/12.737082

KEYWORDS: Crystals, Excitons, Luminescence, Optical properties, Optical spectroscopy, Crystallography, Solids, Organic electronics, Molecular electronics, Oxidation

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Proceedings Article | 8 February 2007 Paper

Charge trapping on defects in AlGaN/GaN field effect transistors

Oleg Mitrofanov, M. Manfra

Proceedings Volume 6473, 64731M (2007) https://doi.org/10.1117/12.707740

KEYWORDS: Transistors, Field effect transistors, Gallium nitride, Spectroscopes, Gallium, 3D modeling, Ionization, Semiconductors, Reliability, Heterojunctions

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Proceedings Article | 8 February 2007 Paper

High quality UV AlGaN/AlGaN distributed Bragg reflectors and microcavities

Oleg Mitrofanov, S. Schmult, M. Manfra, T. Siegrist, N. Weimann, A. Sergent, R. Molnar

Proceedings Volume 6473, 64731G (2007) https://doi.org/10.1117/12.707924

KEYWORDS: Aluminum, Reflectivity, Gallium, Gallium nitride, Optical microcavities, Absorption, Distributed Bragg reflectors, Mirrors, Ultraviolet radiation, Refractive index

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Showing 5 of 34 publications

Proceedings Volume Editor (3)

SPIE Conference Volume | 4 October 2019

Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz 2019

SPIE Conference Volume | 15 October 2018

Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz

SPIE Conference Volume | 19 September 2017

Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017

Conference Committee Involvement (19)

Terahertz Emitters, Receivers, and Applications XVI

3 August 2025 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications XV

18 August 2024 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications XIV

21 August 2023 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications XIII

21 August 2022 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications XII

2 August 2021 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications XI

24 August 2020 | Online Only, California, United States

Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz 2019

14 August 2019 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications X

11 August 2019 | San Diego, California, United States

Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz

22 August 2018 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications IX

19 August 2018 | San Diego, California, United States

Quantum Sensing and Nano Electronics and Photonics XV

28 January 2018 | San Francisco, California, United States

Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017

9 August 2017 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications VIII

6 August 2017 | San Diego, California, United States

Quantum Sensing and Nano Electronics and Photonics XIV

29 January 2017 | San Francisco, California, United States

Terahertz Emitters, Receivers, and Applications VII

28 August 2016 | San Diego, California, United States

Quantum Sensing and Nano Electronics and Photonics XIII

14 February 2016 | San Francisco, California, United States

Terahertz Emitters, Receivers, and Applications VI

11 August 2015 | San Diego, California, United States

Quantum Sensing and Nanophotonic Devices XII

8 February 2015 | San Francisco, California, United States

Quantum Sensing and Nanophotonic Devices XI

2 February 2014 | San Francisco, California, United States

Showing 5 of 19 Conference Committees

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