Morphology-dependent resonances of a microsphere-optical fiber system

Giora Griffel, Stephen Arnold, Dogan Taskent, Ali Serpengüzel, John Connolly, Nancy Morris

Research output: Contribution to journalArticlepeer-review


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 Q0. 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.

Original languageEnglish (US)
Pages (from-to)695-697
Number of pages3
JournalOptics Letters
Issue number10
StatePublished - May 15 1996

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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