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Proceedings Paper

Observation of highly efficient second-harmonic generation at the nanoscale driven by bound states in the continuum
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Paper Abstract

Recent developments in the physics of Mie-resonant high-index dielectric nanostructures suggested a promising pathway to improve efficiencies of the nonlinear light conversion beyond the limits imposed by plasmonics. Here, we employ the concept of bound states in the continuum to experimentally demonstrate a sharp enhancement of the second-harmonic generation efficiency at localized states formed via destructive interference of two leaky modes. For an AlGaAs subwavelength disk with optimized parameters, pumped with a structured light and placed on an engineered multilayered substrate, we observe the record-high conversion efficiency compared to the previous demonstrations with isolated subwavelength resonators.

Paper Details

Date Published: 26 February 2020
PDF: 8 pages
Proc. SPIE 11290, High Contrast Metastructures IX, 112900C (26 February 2020); doi: 10.1117/12.2544231
Show Author Affiliations
Kirill Koshelev, The Australian National Univ. (Australia)
ITMO Univ. (Russian Federation)
Sergey Kruk, The Australian National Univ. (Australia)
Elizaveta Melik-Gaykazyan, The Australian National Univ. (Australia)
Lomonosov Moscow State Univ. (Russian Federation)
Jae-Hyuck Choi, Korea Univ. (Korea, Republic of)
Andrey Bogdanov, ITMO Univ. (Russian Federation)
Hong-Gyu Park, Korea Univ. (Korea, Republic of)
Yuri Kivshar, The Australian National Univ. (Australia)
ITMO Univ. (Russian Federation)

Published in SPIE Proceedings Vol. 11290:
High Contrast Metastructures IX
Connie J. Chang-Hasnain; Andrei Faraon; Weimin Zhou, Editor(s)

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