Coupled whispering gallery modes in a multilayer-coated microsphere

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Whispering gallery modes in a microsphere coated with three layers of high, low, and high refractive indices (RIs) are considered. Coastal modes and inland modes, centered on the outer and inner high-RI layers, exist as different radial modes. At right values of RI and thickness of the three layers, an inland mode and a coastal mode couple to produce a radial distribution of the photonic field that resembles bonding and antibonding orbitals. The coupling occurs across a layer of the middle low-RI layer, much thicker than the wave-length of light. The coupling is analyzed in a quantum-mechanical analog of a one-dimensional particle in a double-well potential.

Original languageEnglish (US)
Pages (from-to)1147-1149
Number of pages3
JournalOptics Letters
Issue number9
StatePublished - May 1 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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