Robust enhancement of high-harmonic generation from all-dielectric metasurfaces enabled by polarization-insensitive bound states in the continuum

Abstract

The emerging all-dielectric platform exhibits high-quality ($Q$) resonances governed by the physics of bound states in the continuum (BIC) that drives highly efficient nonlinear optical processes. Here we demonstrate the robust enhancement of third-(THG) and fifth-harmonic generation (FHG) from all-dielectric metasurfaces composed of four silicon nanodisks. Through the symmetry breaking, the genuine BIC transforms into the high-$Q$ quasi-BIC resonance with tight field confinement for record high THG efficiency of $3.9\times 10^{-4}$ W${}^{-2}$ and FHG efficiency of $4.8\times 10^{-10}$ W${}^{-4}$ using a moderate pump intensity of 1 GW/cm${}^2$. Moreover, the quasi-BIC and the resonantly enhanced harmonics exhibit polarization-insensitive characteristics due to the special $C_4$ arrangement of meta-atoms. Our results suggest the way for smart design of efficient and robust nonlinear nanophotonic devices.

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Cited by in corpus (3)

• High-efficiency optical frequency mixing in an all-dielectric metasurface enabled by multiple bound states in the continuum
• Enhanced sum-frequency generation from etchless lithium niobate empowered by dual quasi-bound states in the continuum
• Efficient high harmonic generation in nonlinear photonic moiré superlattice