近日，北京大学肖云峰团队研究了光学微腔中旋转对称破缺的色散工程。2026年1月22日，《光：科学与应用》杂志发表了这篇论文。
色散工程在非线性光学中至关重要，但其发展常受限于材料与结构的制约。
研究组提出以旋转对称性破缺作为光学微腔色散工程的指导原则。通过边界形变，岛模中涌现出多分支全局色散；同时借助准回音壁模式间的共振隧穿效应实现对局部色散的调控。基于全局色散的调控，研究组预测在蓝紫光波段可实现高效率（>55%）且大频移（>180 THz）的光学参量振荡。利用局部色散工程，共振隧穿机制成功调控了倍频产生的双共振增强效应。
附：英文原文
Title: Dispersion engineering by rotational symmetry breaking in an optical microcavity
Author: Ren, Jian-Zheng, Li, Li-Jie, Zhang, Rui-Qi, Wang, Zhi-Yan, Cao, Qi-Tao, Xiao, Yun-Feng
Issue&Volume: 2026-01-22
Abstract: Dispersion engineering is pivotal for nonlinear optics, yet it often faces challenges posed by material and structural limitations. Here, we establish rotational symmetry breaking as the guiding principle for dispersion engineering in optical microcavities. Through boundary deformation, multi-branch global dispersion emerges in island modes, and local dispersion is controlled via resonance-assisted tunneling between quasi-whispering gallery modes. Enabled by the global dispersion, the optical parametric oscillation is predicted in blue-violet light spectrum with high efficiency (>55%) and large frequency separation (>180THz). Using the local dispersion engineering, the doubly-resonant enhancement of second-harmonic generation is regulated by the resonance-assisted tunneling.
DOI: 10.1038/s41377-025-02169-2