Optical microcavities have attracted tremendous interest in both fundamental and applied research over the past few decades thanks to their small footprint, easy integration, and high quality factors. Using total internal reflection from a dielectric interface or photonic band gaps in a periodic structure, these devices do not rely on conventional metal-coated mirrors to confine light in small volumes, which have brought forth new developments in both classical and quantum optics. Topics to be explored in this special issue include, but are not limited to:
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