Experimental Demonstration of High-Efficiency Harmonic Generation in Photonic Moire Superlattice Microcavities

被引:2
作者
Wang, Xuying [1 ]
Liu, Zhuojun [2 ,3 ]
Chen, Bo [1 ]
Qiu, Guixin [1 ]
Wei, Dunzhao [1 ]
Liu, Jin [1 ]
机构
[1] Sun Yat Sen Univ, Sch Phys, Sch Elect & Informat Technol, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China
[2] Peking Univ, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
[3] Peking Univ, Frontiers Sci Ctr Nanooptoelectron, Sch Phys, Beijing 100871, Peoples R China
基金
中国博士后科学基金; 国家重点研发计划; 中国国家自然科学基金;
关键词
photonic moire superlattice; third-harmonicgeneration; second-harmonic generation; criticalcoupling; BOUND-STATES;
D O I
10.1021/acs.nanolett.4c03632
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Integrated photonic microcavities have demonstrated powerful enhancement of nonlinear effects, but they face a challenge in achieving critical coupling for sufficient use of incident pump power. In this work, we first experimentally demonstrate that highly efficient third-harmonic generation (THG) and detectable second-harmonic generation (SHG) can be produced from high-Q photonic moire superlattice microcavities, where a critical coupling condition can be achieved via selecting a magic angle. Furthermore, at the magic angle of 13.17 degrees, critical coupling is satisfied, resulting in a normalized THG conversion efficiency of 136%/W-2 at a relatively low peak pump power of 6.8 MW/cm(2), which is 3 orders of magnitude higher than the best results reported previously. Our work shows the power of photonic moire superlattices in enhancing nonlinear optical performances through flexible and feasible engineering resonant modes, which can be applied in integrated frequency conversion and generation of quantum light sources.
引用
收藏
页码:11327 / 11333
页数:7
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