Experimental demonstration of resonant third-harmonic generation using quasi-BIC resonances in silicon elliptical dimer metasurfaces with nanodisk couplers

Urmila Bag; Lal Krishna A. S.; Jyothsna K. M.; Varun Raghunathan

doi:10.1117/12.3002169

13 March 2024 Experimental demonstration of resonant third-harmonic generation using quasi-BIC resonances in silicon elliptical dimer metasurfaces with nanodisk couplers

Urmila Bag, Lal Krishna A. S., Jyothsna K. M., Varun Raghunathan

Author Affiliations +

Proceedings Volume 12897, High Contrast Metastructures XIII; 1289703 (2024) https://doi.org/10.1117/12.3002169
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Design and experimental demonstration of resonant two-dimensional amorphous silicon (a-Si) metasurface supporting mid-infrared quasi-BIC resonances and its application for resonant third harmonic generation enhancement are discussed. Symmetry-protected bound-state-in-continuum resonance is made accessible with the addition of nanodisk couplers in between elliptical dimers with a vertical offset in the symmetry plane. Fabricated quasi-BIC resonant structures show a clear transmission resonance peak at 2470 nm wavelength with a Q-factor of 80. Third-harmonic generation (THG) based up-conversion from 2470 nm fundamental excitation to 823 nm THG shows resonant THG enhancement by 35 times for TM polarized excitation with strong polarization dependence.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Urmila Bag, Lal Krishna A. S., Jyothsna K. M., and Varun Raghunathan "Experimental demonstration of resonant third-harmonic generation using quasi-BIC resonances in silicon elliptical dimer metasurfaces with nanodisk couplers", Proc. SPIE 12897, High Contrast Metastructures XIII, 1289703 (13 March 2024); https://doi.org/10.1117/12.3002169

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