Phys. Rev. A 71, 013817 (2005) [10 pages]Ultrahigh-Q toroidal microresonators for cavity quantum electrodynamicsReceived 27 August 2004; published 26 January 2005 We investigate the suitability of toroidal microcavities for strong-coupling cavity quantum electrodynamics (QED). Numerical modeling of the optical modes demonstrate a significant reduction of the modal volume with respect to the whispering gallery modes of dielectric spheres, while retaining the high-quality factors representative of spherical cavities. The extra degree of freedom of toroid microcavities can be used to achieve improved cavity QED characteristics. Numerical results for atom-cavity coupling strength g, critical atom number N0, and critical photon number n0 for cesium are calculated and shown to exceed values currently possible using Fabry-Perot cavities. Modeling predicts coupling rates g∕2π exceeding 700 MHz and critical atom numbers approaching 10−7 in optimized structures. Furthermore, preliminary experimental measurements of toroidal cavities at a wavelength of 852 nm indicate that quality factors in excess of 108 can be obtained in a 50‐μm principal diameter cavity, which would result in strong-coupling values of (g∕(2π),n0,N0)=(86 MHz,4.6×10−4,1.0×10−3). © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.013817
DOI:
10.1103/PhysRevA.71.013817
PACS:
42.50.Pq, 32.80.−t, 42.50.Ct, 42.60.Da
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