Presentation Information
[10p-C310-14]Whispering gallery modes with self-intersecting geodesic paths around asymmetric microbubble resonators
〇Pin Christophe1, Amal Jose1, Ramgopal Madugani1, Sile Nic Chormaic1 (1.OIST)
Keywords:
whispering gallery mode,microresonator,deformation
The ultra-high Q factor resonances of whispering gallery mode (WGM) microresonators allows for harnessing strong light-matter interactions for nonlinear optics and optical sensing, among other applications. In this work, we investigate the effect of three-dimensional limaçon-like deformations on the topology of WGMs. First, we use transformation optics to model the propagation of light within flat, two-dimensional representations of the curved surface of deformed cavities. After tuning the azimuthal and axial curvature ratio, we observe the emergence of new stable optical trajectories with a self-intersecting point located at a specific azimuthal position along the equator line. In good agreement with numerical results, the existence of WGMs with self-intersecting geodesic paths is experimentally demonstrated using asymmetric thin-walled microbubble resonators.