title: Photonic molecules formed by coupled hybrid resonators.
abstract: We describe a method that enables free-standing whispering-gallery-mode microresonators, and report spectral tuning of photonic molecules formed by coupled free and on-chip resonators with different geometries and materials. We study direct coupling via evanescent fields of free silica microtoroids and microspheres with on-chip polymer coated silica microtoroids. We demonstrate thermal tuning of resonance modes to achieve maximal spectral overlap, mode splitting induced by direct coupling, and the effects of distance between the resonators on the splitting spectra.
authors: Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA. pengb@ese.wustl.edu
authors: Bo
authors: B
authors: Peng
authors: Sahin Kaya
authors: SK
authors: Ozdemir
authors: Jiangang
authors: J
authors: Zhu
authors: Lan
authors: L
authors: Yang