Transporting the Optical Chirality through the Dynamical Barriers in Optical Microcavities

In mixed phase space structures, the stable islands and chaotic sea are separated by dynamical barriers. Considering the small tunneling rate, intuitively, the properties of long-lived resonances within stable islands are supposed to be less affected by the perturbations in chaotic sea. Here, the modifications on the chaotic sea which can be transported through dynamical barriers and strongly affect long-lived resonances within stable islands are experimentally demonstrated. In waveguide-connected quadruple microdisks (WCQMs), the finite orbital angular momentum and the propagation directions of long-lived resonances within stable islands could be changed and controlled by the waveguides connecting to the chaotic sea. The numerical calculations and the corresponding 4 x 4 non-Hermitian Hamiltonian theoretical model match the experimental results well and demonstrate the essential roles of asymmetrical scattering in the chaotic sea and chaotic-to-regular tunneling. This research will be interesting for fundamental studies on quantum chaos and practical applications in optical sensing.