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Forced and self-excited oscillations of an optomechanical cavity

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arxiv 1104.2237 v3 pith:YG5MXJBG submitted 2011-04-12 cond-mat.other physics.optics

Forced and self-excited oscillations of an optomechanical cavity

classification cond-mat.other physics.optics
keywords mirroroptomechanicaloscillationsmechanicalcavitycomparisoncouplingforced
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We experimentally study forced and self oscillations of an optomechanical cavity which is formed between a fiber Bragg grating that serves as a static mirror and between a freely suspended metallic mechanical resonator that serves as a moving mirror. In the domain of small amplitude mechanical oscillations, we find that the optomechanical coupling is manifested as changes in the effective resonance frequency, damping rate and cubic nonlinearity of the mechanical resonator. Moreover, self oscillations of the micromechanical mirror are observed above a certain optical power threshold. A comparison between the experimental results and a theoretical model that we have recently presented yields a good agreement. The comparison also indicates that the dominant optomechanical coupling mechanism is the heating of the metallic mirror due to optical absorption.

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