Wang Xuying, Liu Zhuojun, Chen Bo, Qiu Guixin, Wei Dunzhao, Liu Jin
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China.
Nano Lett. 2024 Sep 11;24(36):11327-11333. doi: 10.1021/acs.nanolett.4c03632. Epub 2024 Aug 28.
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- photonic moiré superlattice microcavities, where a critical coupling condition can be achieved via selecting a magic angle. Furthermore, at the magic angle of 13.17°, critical coupling is satisfied, resulting in a normalized THG conversion efficiency of 136%/W at a relatively low peak pump power of 6.8 MW/cm, which is 3 orders of magnitude higher than the best results reported previously. Our work shows the power of photonic moiré 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.
集成光子微腔已展现出对非线性效应的强大增强作用，但在实现临界耦合以充分利用入射泵浦功率方面面临挑战。在这项工作中，我们首先通过实验证明，从高光子莫尔超晶格微腔中可以产生高效的三次谐波产生（THG）和可检测到的二次谐波产生（SHG），其中通过选择一个魔角可以实现临界耦合条件。此外，在13.17°的魔角下，满足临界耦合条件，在相对较低的6.8 MW/cm的峰值泵浦功率下，归一化的THG转换效率达到136%/W，这比之前报道的最佳结果高出3个数量级。我们的工作展示了光子莫尔超晶格通过灵活且可行的工程共振模式增强非线性光学性能的能力，这可应用于集成频率转换和量子光源的产生。
