Dr. Lei Kang Profile

Dr. Lei Kang

Assistant Research Professor at Pennsylvania State Univ

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Publications (6)

Proceedings Article | 4 October 2023 Presentation + Paper

Dielectric metasurfaces for switchable nonlinear optics

Lei Kang, Douglas Werner

Proceedings Volume 12647, 126470F (2023) https://doi.org/10.1117/12.2676453

KEYWORDS: Dielectric polarization, Dielectrics, Second harmonic generation, Silicon, Nonlinear optics, Nanostructures, Optical switching, Reflection, Harmonic generation

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Proceedings Article | 3 October 2022 Presentation + Paper

Light-switchable quasi-BIC optical vortex generators

Yuhao Wu, Lei Kang, Sawyer Campbell, Pingjuan Werner, Douglas Werner

Proceedings Volume 12196, 1219609 (2022) https://doi.org/10.1117/12.2632656

KEYWORDS: Spiral phase plates, Optical vortices, Silicon, Modulation, Nonlinear dynamics, Ultrafast phenomena, Transient nonlinear optics, Polarization, Amorphous silicon, Ultrafast lasers

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Proceedings Article | 25 August 2020 Presentation

Ultrafast light manipulation by using nonlinear chiral meta-mirror

Cheng-Yu Wang, Lei Kang, Xuexue Guo, Xingjie Ni, Douglas Werner, Zhiwen Liu

Proceedings Volume 11497, 114970M (2020) https://doi.org/10.1117/12.2570776

KEYWORDS: Ultrafast phenomena, Dielectric polarization, Amorphous silicon, Split ring resonators, Silver, Silica, Light-matter interactions, Absorption, Picosecond phenomena, Modulation

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Proceedings Article | 3 May 2020 Presentation

High-performance reconfigurable meta-optics based on optical phase change materials (Rising Researcher) (Conference Presentation)

Tian Gu, Mikhail Shalaginov, Sensong An, Sawyer Campbell, Yifei Zhang, Carlos Ríos, Lei Kang, Myungkoo Kang, Claudia Gonçalves, Clara Rivero-Baleine, Kathleen Richardson, Douglas Werner, Hualiang Zhang, Juejun Hu

Proceedings Volume 11389, 113890O (2020) https://doi.org/10.1117/12.2557439

KEYWORDS: Imaging systems, Optical properties, Photonic devices, Optical switching, Transparency, Glasses, Switching, Transition metals, Solid state physics

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Proceedings Article | 24 August 2017 Paper

Electrically driven hybrid photonic metamaterials for multifunctional control

Lei Kang, Liu Liu, Sawyer Campbell, Taiwei Yue, Qiang Ren, Theresa Mayer, Douglas Werner

Proceedings Volume 10345, 103451G (2017) https://doi.org/10.1117/12.2273218

KEYWORDS: Metamaterials, Photonic metamaterials, Vanadium, Camouflage, Light-matter interactions, Dielectrics, Active optics, Magnetism, Refractive index

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The unique light-matter interaction in metamaterials, a type of artificial medium in which the geometrical features of subunits dominate their optical responses, have been utilized to achieve exotic material properties that are rare or nonexistent in natural materials. Furthermore, to extend their behaviors, active materials have been introduced into metamaterial systems to advance tunability, switchability and nonlinearity. Nevertheless, practical examples of versatile photonic metamaterials remain exceedingly rare for two main reasons. On the one hand, in sharp contrast to the broad material options available at lower frequencies, it is less common to find active media in the optical regime that can provide pronounced dielectric property changes under external stimuli, such as electric and magnetic fields. Vanadium dioxide (VO₂), offering a large refractive index variation over a broad frequency range due to its near room temperature insulator-to-metal transition (IMT), has been favored in recent studies on tunable metamaterials. On the other hand, it turns out that regulating responses of hybrid metamaterials to external forces in an integrated manner is not a straightforward task. Recently, metamaterial-enabled devices (i.e., metadevices) with ‘self-sufficient’ or ‘self-contained’ electrical and optical properties have enabled complex functionalities. Here, we present a design methodology along with the associated experimental validation of a VO₂ thin film integrated optical metamaterial absorber as a hybrid photonic platform for electrically driven multifunctional control, including reflectance switching, a rewritable memory process and manageable localized camouflage. The nanoengineered topologically continuous metal structure simultaneously supports the optical resonance and electrical functionality that actuates the phase transition in VO₂ through the process of Joule heating. This work provides a universal approach to creating self-sufficient and highly-versatile nanophotonic systems.

Proceedings Article | 28 April 2017 Presentation

Geometrically-induced loss suppression in plasmoelectronic nanostructures (Conference Presentation)

Shoufeng Lan, Sean Rodrigues, Mohammad Taghinejad, Lei Kang, Devin Brown, Augustine Urbas, Wenshan Cai

Proceedings Volume 10112, 101121G (2017) https://doi.org/10.1117/12.2251429

KEYWORDS: Local area networks, Alternate lighting of surfaces, Plasmonics, Nanostructures, Resonance enhancement, Nanostructuring, Metals, Surface plasmon polaritons, Optical design, Light-matter interactions

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