Enhanced second harmonic generation in high-$Q$ all-dielectric metasurfaces with backward frequency conversion

Abstract

Here we employ the quasi-bound state in the continuum (quasi-BIC) resonance in all-dielectric metasurfaces for efficient nonlinear processes in consideration of the backward frequency conversion. We theoretically study the second-harmonic generation (SHG) from symmetry-broken AlGaAs metasurfaces and reveal the efficiency enhancement empowered by high-$Q$ quasi-BIC resonances. By introducing the correction term of nonlinear polarization at the fundamental wave field to the conventional undepleted approximation, we uncover the effect of backward frequency conversion on the nonlinear conversation efficiency. The SHG efficiency as $2.45\times 10^{-2}$ with the developed depleted model, shows a $14.3\%$ decrease compared with $2.86\times 10^{-2}$ in conventional undepleted approximation, under the incident intensity of 10 MW/cm${}^2$. Our results are of significant importance for designing efficient nonlinear metasurfaces supporting high-$Q$ resonances.

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• Si Metasurface Supporting Multiple Quasi-BICs for Degenerate Four-Wave Mixing

Cited by in corpus (2)

• Enhanced third-harmonic generation and degenerate four-wave mixing in an all-dielectric metasurfaces via Brillouin zone folding-induced bound states in the continuum
• Electro-optically tunable second-harmonic generation in lithium niobate metasurfaces boosted by Brillouin zone folding induced bound states in the continuum