Dielectric microspheres are used to resonantly couple light from an optical fiber half coupler to a large-area silicon photodetector. Dielectric microspheres possess high quality factor morphology-dependent resonances, i.e., whispering gallery modes. The observed resonances have a channel spacing of 0.14 nm and a linewidth of 0.06 nm. These resonances provide the narrow linewidths necessary for high-resolution optical spectroscopy applications. Optical communication applications of this system are studied experimentally and theoretically.
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Serpengüzel et al. (2004) studied this question.