title: Coupled whispering gallery modes in a multilayer-coated microsphere.
abstract: 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 wavelength of light. The coupling is analyzed in a quantum-mechanical analog of a one-dimensional particle in a double-well potential.
authors.affiliation: Microparticle Photophysics Laboratory Polytechnic University, NY 11201, USA. teraoka@poly.edu
authors.forename: Iwao
authors.initials: I
authors.lastname: Teraoka
authors.forename: Stephen
authors.initials: S
authors.lastname: Arnold