Excitation Localization Principle For Whispering-Gallery Mode Microcavities

There is interest in utilizing whispering gallery mode (WGM) microcavities for photonic applications1 (e.g., signal processing and environmental sensing) as well as in fundamental physics studies (e.g., cavity QED). These symmetric structures (e.g., spheres and disks) are relatively easy to fabricate yet display cavity Qs far surpassing those of similar sized Fabry-Perot resonators. The exceptional Qs result from near total internal reflection of circulating waves and are limited only by minimal photon tunneling through the curved interface.

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