In this paper, we investigate cooling of a levitated nanosphere in a system of coupled cavities in the resolved sideband regime. Thanks to the presence of an extra resonance in the coupled cavity cooling system, the coupling strength can be maximized at the optimum detuning. In this fashion, the intracavity photon number is increased, and thereby the cooling rate is enhanced and the strong coupling regime is achieved without resorting to increased driving laser power. The underlying physics of the increased cooling efficiency in the system of coupled cavities in the resolved sideband regime proposed here and that of the already reported system of coupled cavities in the unresolved sideband regime are significantly different from each other. Since the spectral density of the displacement of the particle can no longer be accurately approximated by the conventional Lorentzian line shape in the strong coupling regime, a double Lorentzian line shape is employed to accurately approximate the spectral density of the displacement of the particle and to provide analytical formulations for the cooling rate. The analytical expression given for the cooling rate is validated by numerical simulations.
© 2018 Optical Society of AmericaFull Article | PDF Article
CorrectionsMohammad Ali Abbassi and Khashayar Mehrany, "Employing coupled cavities to increase the cooling rate of a levitated nanosphere in the resolved sideband regime: publisher’s note," J. Opt. Soc. Am. B 35, 2065-2065 (2018)
18 July 2018: A typographical correction was made to the author listing.
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