Efficient optical harmonic generations from high-Q quasibound states in the continuum

Zhuojun Liu; Yi Xu; Jin Liu

doi:10.1117/12.2567646

20 August 2020 Efficient optical harmonic generations from high-Q quasibound states in the continuum

Zhuojun Liu, Yi Xu, Jin Liu

Proceedings Volume 11460, Metamaterials, Metadevices, and Metasystems 2020; 114602C (2020) https://doi.org/10.1117/12.2567646
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Conference Poster

Abstract

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.

Conference Presentation

Citation Download Citation

Zhuojun Liu, Yi Xu, and Jin Liu "Efficient optical harmonic generations from high-Q quasibound states in the continuum", Proc. SPIE 11460, Metamaterials, Metadevices, and Metasystems 2020, 114602C (20 August 2020); https://doi.org/10.1117/12.2567646

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