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.
© 2007 Optical Society of America
Original Manuscript: November 20, 2006
Revised Manuscript: January 8, 2007
Manuscript Accepted: January 29, 2007
Published: April 3, 2007
Iwao Teraoka and Stephen Arnold, "Coupled whispering gallery modes in a multilayer-coated microsphere," Opt. Lett. 32, 1147-1149 (2007)