Chiral harmonic generation studies from partially etched amorphous silicon nanodisk arrays

Jayanta Kumar Deka; Jyothsna K.M.; Rabindra Biswas; Varun Raghunathan

doi:10.1117/12.2650517

17 March 2023 Chiral harmonic generation studies from partially etched amorphous silicon nanodisk arrays

Jayanta Kumar Deka, Jyothsna K.M., Rabindra Biswas, Varun Raghunathan

Proceedings Volume 12423, 2D Photonic Materials and Devices VI; 124230A (2023) https://doi.org/10.1117/12.2650517
Event: SPIE OPTO, 2023, San Francisco, California, United States

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.

Conference Presentation

Citation Download Citation

Jayanta Kumar Deka, Jyothsna K.M., Rabindra Biswas, and Varun Raghunathan "Chiral harmonic generation studies from partially etched amorphous silicon nanodisk arrays", Proc. SPIE 12423, 2D Photonic Materials and Devices VI, 124230A (17 March 2023); https://doi.org/10.1117/12.2650517

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