Optical microcavities play a significant role in the study of classical and quantum chaos. To date, most experimental explorations of their internal wave dynamics have focused on the properties of their inputs and outputs, without directly interrogating the dynamics and the associated mode patterns inside. As a result, this key information is rarely retrieved with certainty, which significantly restricts the verification and understanding of the actual chaotic motion. Here we demonstrate a simple and robust approach to directly and rapidly map the internal mode patterns in chaotic microcavities. By introducing a local index perturbation through a pump laser, we report a spectral response of optical microcavities that is proportional to the internal field distribution. With this technique, chaotic modes with staggered mode spacings can be distinguished. Consequently, a complete chaos assisted tunneling (CAT) and its time-reversed process are experimentally verified in the optical domain with unprecedented certainty.

光学微腔在经典和量子混沌的研究中发挥着重要作用。迄今为止，对其内部波动力学的大多数实验探索都集中在其输入和输出的特性上，而没有直接询问内部的动力学和相关的模式模式。因此，很少能确定地检索到这些关键信息，这极大地限制了对实际混沌运动的验证和理解。在这里，我们展示了一种简单而强大的方法，可以直接快速地映射混沌微腔中的内部模式模式。通过泵浦激光器引入局部折射率扰动，我们报告了与内部场分布成正比的光学微腔的光谱响应。有了这个技术，可以区分具有交错模式间距的混沌模式。因此，完整的混沌辅助隧道（CAT）及其时间反转过程在光域中以前所未有的确定性得到了实验验证。