Ultrahigh-Q toroidal microresonators for cavity quantum electrodynamics

Journal Article · Sat Jan 01 04:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.013817· OSTI ID:20650299

Spillane, S M; Kippenberg, T J; Vahala, K J; Goh, K W; Wilcut, E; Kimble, H J ^[1]

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1. Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125 (United States)

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 N{sub 0}, and critical photon number n{sub 0} for cesium are calculated and shown to exceed values currently possible using Fabry-Perot cavities. Modeling predicts coupling rates g/2{pi} exceeding 700 MHz and critical atom numbers approaching 10{sup -7} in optimized structures. Furthermore, preliminary experimental measurements of toroidal cavities at a wavelength of 852 nm indicate that quality factors in excess of 10{sup 8} can be obtained in a 50-{mu}m principal diameter cavity, which would result in strong-coupling values of (g/(2{pi}),n{sub 0},N{sub 0})=(86 MHz,4.6x10{sup -4},1.0x10{sup -3})

• OSTI ID: 20650299
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CESIUM
COMPUTERIZED SIMULATION
COUPLING
DEGREES OF FREEDOM
DIELECTRIC MATERIALS
MHZ RANGE
NUMERICAL ANALYSIS
OPTICAL MODES
OPTICS
PHOTONS
QUALITY FACTOR
QUANTUM ELECTRODYNAMICS
SPHERES
SPHERICAL CONFIGURATION
WAVELENGTHS