title: Morphology-dependent resonances of a microsphere-optical fiber system.
abstract: Morphology-dependent resonances of microspheres sitting upon an index-matched single-mode fiber half-coupler are excited by a tunable 753-nm distributed-feedback laser. Resonance peaks in the scattering spectra and associated dips in the transmission spectra for the TE and TM modes are observed. We present a new model that describes this interaction in terms of the fiber-sphere coupling coefficient and the microsphere's intrinsic quality factor Q(0). This model enables us to obtain expressions for the finesse and the Q factor of the composite particle-fiber system, the resonance width, and the depth of the dips measured in the transmission spectra. Our model shows that index matching improves the coupling efficiency by more than a factor of 2 compared with that of a non-index-matched system.
authors.forename: G
authors.initials: G
authors.lastname: Griffel
authors.forename: S
authors.initials: S
authors.lastname: Arnold
authors.forename: D
authors.initials: D
authors.lastname: Taskent
authors.forename: A
authors.initials: A
authors.lastname: Serpengüzel
authors.forename: J
authors.initials: J
authors.lastname: Connolly
authors.forename: N
authors.initials: N
authors.lastname: Morris