High-Q resonance are universal resources across different branches of physics, e.g., in acoustics, electronics, and electromagnetics, etc. Recently, quasibound states in the continuum (quasi-BICs) has become an enabling platform for realizing high-Q resonance. Therefore, it is highly attractive to employ the quasi-BICs for exploring the nonlinear optical process in nanoscale with light coupling from space. In this work, we’ve achieved the high-Q quasi-BIC resonance in all-dielectric metasurfaces by introducing asymmetry in the unit cells. We’ve achieved quasi-BIC resonance in telecom band under the normal excitation condition. By tuning pico-second pulsed into the quasi-BIC resonance, third harmonic generation with a normalized conversion efficiency of 1.4x10^−8/W^2 and even pronounced second harmonic generation which is in absence in silicon are simultaneously achieved.
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