28 June 1999 Nonlinear optical effects in the whispering-gallery modes of microspheres
Author Affiliations +
Abstract
The optical whispering-gallery modes of dielectric microspheres can have extremely sharp resonances, with quality factors as large as Q = 1010. Using evanescent coupling for input and output, an effective ring resonator is produced, with a large intracavity field enhancement. It has been suggested that optical nonlinearities might be enhanced using these modes. Our effort to do so is described herein. The nonlinear medium is a composite, in which semiconductor nanoparticles are the active component and constitute a small volume fraction. This can be achieved by fabricating microspheres from semiconductor-doped glasses or by coating fused-silica spheres. Because the field distribution of a whispering-gallery mode is strongly localized near the sphere's surface and includes an evanescent tail external to the sphere, thin-film coating is a practical option, and this technique offers several advantages. The properties of whispering-gallery modes and optical coupling are discussed, the processes of fabrication and coating are described, and the operational characteristics and potential applications of nonlinear optical behavior in microspheres are considered.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Albert T. Rosenberger, "Nonlinear optical effects in the whispering-gallery modes of microspheres", Proc. SPIE 3793, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials, (28 June 1999); doi: 10.1117/12.351413; https://doi.org/10.1117/12.351413
PROCEEDINGS
8 PAGES


SHARE
Back to Top