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Multistate Tuning of Third Harmonic Generation in Fano‐Resonant Hybrid Dielectric Metasurfaces (Adv. Funct. Mater. 48/2021)

Qi Jie Wang, Hong Liu, and co-workers demonstrate multistate tuning of thirdharmonic generation via hybrid nonlinear metasurfaces. The metasurfaces consisting of GST–silicon split ring resonators offer a large third-order nonlinearity in the visible range. A high Q-factor Fano resonance of up to 125 is experimentally achieved together with a third-harmonic conversion efficiency of 2.9 × 10-6 % at a peak pump density of 1.7 GW cm2. MULTISTATE TUNING