Physics – Instrumentation and Detectors
Scientific paper
2011-07-05
Physics
Instrumentation and Detectors
Scientific paper
Regenerative amplification is demonstrated in a cavity optoelectromechanical system using electrical gradient forces and optomechanical transduction. Mechanical linewidth narrowing to $6.6 \pm 1.4$ mHz was observed at a frequency of 27.3 MHz, corresponding to an effective mechanical quality factor of $4 \times 10^9$. A theoretical model of the system was formulated, showing that the delay in electrical feedback allows additional linewidth narrowing compared to purely optomechanical regenerative amplification. The linewidth was confirmed experimentally to scale inversely with the mechanical energy as predicted by the model.
Bowen Warwick P.
Knittel Joachim
Lee Kwan H.
McRae Terry G.
Szorkovszky Alex
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