Electrodynamical light trapping using whispering-gallery resonances in hyperbolic cavities

Chihhui Wu, Alessandro Salandrino, Xingjie Ni, Xiang Zhang

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36 Scopus citations


We theoretically study spherical cavities composed of hyperbolic metamaterials with indefinite permittivity tensors. Such cavities are capable of electrodynamically confining fields with deep subwavelength cavity sizes. The supported resonant modes are analogous to the whispering-gallery modes found in dielectric microcavities with much larger physical sizes. Because of the nature of electrodynamical confinement, these hyperbolic metamaterial cavities exhibit quality factors higher than predicted in the electrostatic limit. In addition, confining electromagnetic fields into the small cavities results in an extremely high photonic local density of states.

Original languageEnglish (US)
Article number021015
JournalPhysical Review X
Issue number2
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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