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

Kirill Koshelev; Sergey Kruk; Elizaveta Melik-Gaykazyan; Jae-Hyuck Choi; Andrey Bogdanov; Hong-Gyu Park; Yuri Kivshar

doi:10.1117/12.2544231

26 February 2020 Observation of highly efficient second-harmonic generation at the nanoscale driven by bound states in the continuum

Kirill Koshelev, Sergey Kruk, Elizaveta Melik-Gaykazyan, Jae-Hyuck Choi, Andrey Bogdanov, Hong-Gyu Park, Yuri Kivshar

Author Affiliations +

Proceedings Volume 11290, High Contrast Metastructures IX; 112900C (2020) https://doi.org/10.1117/12.2544231
Event: SPIE OPTO, 2020, San Francisco, California, United States

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.

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Kirill Koshelev, Sergey Kruk, Elizaveta Melik-Gaykazyan, Jae-Hyuck Choi, Andrey Bogdanov, Hong-Gyu Park, and Yuri Kivshar "Observation of highly efficient second-harmonic generation at the nanoscale driven by bound states in the continuum", Proc. SPIE 11290, High Contrast Metastructures IX, 112900C (26 February 2020); https://doi.org/10.1117/12.2544231

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