Chiral harmonic generation studies from partially etched amorphous silicon nanodisk arrays

Deka, JK and Jyothsna, KM and Biswas, R and Raghunathan, V (2023) Chiral harmonic generation studies from partially etched amorphous silicon nanodisk arrays. In: 2D Photonic Materials and Devices VI 2023, 31 January - 2 February 2023, San Francisco.

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Abstract

In this work, partially etched amorphous silicon (a-Si) metasurface is designed and fabricated to enhance chiral THG from the a-Si nanodisks and SHG from integrated multilayer GaSe overlayers with spectrally tunable chirality. The metasurfaces are designed to support guided mode resonance in the 1500-1600 nm wavelength range. A minimum degree of circular polarization (DOCP) of -0.6 is obtained experimentally on-resonance for the inherent THG process from the silicon nanodisks with resonant enhancement of more than 5 orders. A spectrally tunable DOCP of -0.5 to 0.5 is obtained for the generated SHG from the GaSe layer on top of the silicon metasurface with resonant enhancement of more than 5 orders.

Item Type:	Conference Paper
Publication:	Proceedings of SPIE - The International Society for Optical Engineering
Publisher:	SPIE
Additional Information:	The copyright for this article belongs to SPIE.
Keywords:	Chirality; Gallium compounds; Harmonic generation; Layered semiconductors; Nonlinear optics; Selenium compounds, 2d material; Degree of circular polarization; Harmonics generation; Metasurface; Nanodisk arrays; Nanodisks; Nonlinear metasurface; Optical chirality; Resonant enhancements; Spectrally tunable, Amorphous silicon
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	15 Jun 2023 09:39
Last Modified:	16 Jun 2023 09:06
URI:	https://eprints.iisc.ac.in/id/eprint/82046

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