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Whispering gallery mode (WGM) cavity is important for exploring physics ofstrong light-matter interaction. Yet it suffers from the notorious radiationloss universally due to the light tunneling effect through the curved boundary.In this work, we propose and demonstrate an optical black hole (OBH) cavitybased on transformation optics. The radiation loss of all WGMs in OBH cavity iscompletely inhibited by an infinite wide potential barrier. Besides, the WGMfield outside the cavity is revealed to follow $1/r^\alpha$ decay rule based onconformal mapping, which is fundamentally different from the conventionalHankel-function distributions in a homogeneous cavity. Experimentally, atruncated OBH cavity is achieved based on the effective medium theory, and boththe Q-factor enhancement and tightly confined WGM field are measured in themicrowave spectra which agree well with the theoretical results. The circularOBH cavity is further applied to the arbitrary-shaped cavities includingsingle-core and multi-core structures with high-Q factor via the conformalmapping. The OBH cavity design strategy can be generalized to resonant modes ofvarious wave systems, such as acoustic and elastic waves, and findsapplications in energy harvesting and optoelectronics.

Conformal optical black hole for cavity