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Observation of Extraordinary SHG from All-Dielectric Nanoantennas Governed by Bound States in the Continuum

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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.

© 2019 The Author(s)

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