In this publication, the validity and limits of the established classification of whispering gallery modes (WGM) are investigated by extensive finite element simulations. A novel WGM classification scheme is introduced, that includes mode coupling and underlying selection rules based on avoided crossings of the modes.
S. Woska et al. Intrinsic mode coupling in mirror-symmetric whispering gallery resonators. Optics Express 30.18 (2022).
DOI: 10.1364/OE.459348