Cavity-Assisted Back Action Cooling of Mechanical Resonators

Details Cavity-Assisted Back Action Cooling of Mechanical Resonators Cavity-Assisted Back Action Cooling of Mechanical Resonators

2008-05-09

arxiv.org/abs/0805.1431v1

New J. Phys.10, 095007 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

20 pages, 4 figures

Scientific paper

10.1088/1367-2630/10/9/095007

We analyze the quantum regime of the dynamical backaction cooling of a mechanical resonator assisted by a driven harmonic oscillator (cavity). Our treatment applies to both optomechanical and electromechanical realizations and includes the effect of thermal noise in the driven oscillator. In the perturbative case, we derive the corresponding motional master equation using the Nakajima-Zwanzig formalism and calculate the corresponding output spectrum for the optomechanical case. Then we analyze the strong optomechanical coupling regime in the limit of small cavity linewidth. Finally we consider the steady state covariance matrix of the two coupled oscillators for arbitrary input power and obtain an analytical expression for the final mechanical occupancy. This is used to optimize the drive's detuning and input power for an experimentally relevant range of parameters that includes the "ground state cooling" regime.

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