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Opt Lett. 2004 Mar 1;29(5):424-6.

Modal analysis of Bragg onion resonators.

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Department of Applied Physics, MS 128-95, California Institute of Technology, Pasadena, California 91125, USA.


From analysis of the high Q modes in a Bragg onion resonator with an omnidirectional reflector cladding, we establish a close analogy between such a resonator and a spherical hollow cavity in perfect metal. We demonstrate that onion resonators are ideal for applications that require a large spontaneous-emission factor beta, such as thresholdless lasers and single-photon devices.


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