Wang Yongsheng, Ren Yuhao, Luo Xiaoxuan, Li Bo, Chen Zaoyu, Liu Zhenzhi, Liu Fu, Cai Yin, Zhang Yanpeng, Liu Jin, Li Feng
Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Faculty of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou, China.
Light Sci Appl. 2022 Oct 25;11(1):308. doi: 10.1038/s41377-022-01009-x.
Asymmetric microcavities supporting Whispering-gallery modes (WGMs) are of great significance for on-chip optical information processing. We establish asymmetric microcavities on topologically curved surfaces, where the geodesic light trajectories completely reconstruct the cavity mode features. The curvature-mediated photon-lifetime engineering enables the enhancement of the quality factors of periodic island modes by up to 200 times. Strong and weak coupling between modes of very different origins occurs when the space curvature brings them into resonance, leading to fine tailoring of the cavity photon energy and lifetime and the observation of non-Hermitian exceptional point (EP). At large space curvatures, the role of the WGMs is replaced by high-Q periodic modes protected by the high stability of island-like light trajectory. Our work demonstrates interesting physical mechanisms at the crosspoint of optical chaotic dynamics, non-Hermitian physics, and geodesic optical devices, and would initiate the novel area of geodesic microcavity photonics.
支持回音壁模式（WGMs）的非对称微腔对于片上光学信息处理具有重要意义。我们在拓扑弯曲表面上建立非对称微腔，其中测地线光轨迹完全重构了腔模特征。曲率介导的光子寿命工程可将周期性岛模的品质因数提高多达200倍。当空间曲率使起源截然不同的模式发生共振时，会出现强耦合和弱耦合，从而实现对腔光子能量和寿命的精细调控，并观察到非厄米特例外点（EP）。在大空间曲率下，WGMs的作用被由岛状光轨迹的高稳定性所保护的高Q周期性模式所取代。我们的工作展示了光学混沌动力学、非厄米特物理和测地线光学器件交叉点处有趣的物理机制，并将开启测地线微腔光子学这一全新领域。
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