Spectral properties of coupled silica microresonators

We theoretically studied mode hybridization of two coupled optical silica microresonators with whispering gallery modes (WGMs). Output spectra and supermode electric field distributions were calculated for various geometric parameters. For microresonators with slightly different diameters the coupling of the fundamental and non-fundamental WGMs was observed, leading to asymmetry in the spectra and the spatial field distributions of the supermodes.