Dr. Sergejs Boroviks Profile

Dr. Sergejs Boroviks

Postdoc Fellow at Ecole Polytechnique Federale de Lausanne

SPIE Involvement:

Editorial Board Member: Advanced Photonics | Author

Publications (2)

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Proceedings Article | 8 June 2023 Presentation

Time-reversal asymmetric nonlinear metasurface

Sergejs Boroviks, Andrei Kiselev, Karim Achouri, Olivier J. Martin

Proceedings Volume PC12569, (2023) https://doi.org/10.1117/12.2671791

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We demonstrate experimentally a nonlinear plasmonic metasurface that exhibits strongly asymmetric second-harmonic generation (SHG), depending on the illuminating direction: when the metasurface is illuminated from one side, it produces a significant SHG signal, whilst this nonlinear response is strongly reduced (approx. 10 dB), upon illumination from the opposite side. This surprising behavior stems from the bianisotropic response of the system, as confirmed by a homogenization analysis and the extraction of the effective susceptibility tensor. At first sight, it could be tempting to interpret this asymmetric response as a non-reciprocal phenomenon, but we will show that actually it is time-reversal asymmetric.

Proceedings Article | 7 May 2018 Paper

Bifunctional metamirrors for simultaneous polarization splitting and focusing

Sergejs Boroviks, Rucha Anil Deshpande, N. Asger Mortensen, Sergey Bozhevolnyi

Proceedings Volume 10671, 106712C (2018) https://doi.org/10.1117/12.2306439

KEYWORDS: Polarization, Gold, Plasmonics, Reflection, Resonators

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Metasurfaces – artificial 2D sheet structures with sub-wavelength periodicity and dimensions of elements – are paving the way to improve traditional optical components by integrating multiple functionalities into one optically flat device. With the progress in nano-fabrication methods, different applications of metasurfaces were demonstrated experimentally, ranging from artificial plasmonic colouring to flat optical components. In this work, we demonstrate implementation of a bifunctional gap-surface-plasmon-based metasurface which, in reflection mode, splits orthogonal linear light polarizations and focuses into different focal spots. The fabricated configuration consists of 50 nm thick gold nanobricks with different lateral dimensions, organized in an array of 240 nm x 240 nm unit cells on the top of a 50 nm thick silicon dioxide layer, which is deposited on an optically thick reflecting gold substrate. Structure is fabricated using standard electron beam lithography and lift-off techniques. Characterization is performed using scanning electron microscopy and optical measurements, including investigation of wavelength dependence of efficiency, focal length and polarization extinction ratio. Our device features high efficiency (up to ~65%) and polarization extinction ratio (up to ~30 dB), exhibiting broadband response in the near-infrared band (750 950 nm wavelength) with the focal length and numerical aperture dependent on the wavelength of incident light. The proposed optical component can be straightforwardly integrated into photonic circuits or fiber optic devices which employ polarization multiplexing.

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