Observation of extraordinary SHG from all-dielectric nanoantennas governed by bound states in the continuum

Koshelev, Kirill; Kruk, Sergey; Choi, Jae Hyuck; Melik-Gaykazyan, Elizaveta V.; Smirnova, Daria; Park, Hong Gyu; Kivshar, Yuri

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Observation of extraordinary SHG from all-dielectric nanoantennas governed by bound states in the continuum

Date

2019

Authors

Koshelev, Kirill

Kruk, Sergey

Choi, Jae Hyuck

Melik-Gaykazyan, Elizaveta V.

Smirnova, Daria

Park, Hong Gyu

Kivshar, Yuri

Abstract

We observe record-high efficiency of the second-harmonic generation from AlGaAs nanoantennas fabricated on a transparent substrate and pumped with structured light. The engineered nanoantennas exhibit high-quality optical resonances governed by quasi-bound states in the continuum.