High-sensitivity monitoring of micromechanical vibration using optical whispering gallery mode resonators

Details High-sensitivity monitoring of micromechanical vibration using optical whispering gallery mode resonators High-sensitivity monitoring of micromechanical vibration using optical whispering gallery mode resonators

2008-05-12

arxiv.org/abs/0805.1608v1

Physics

Quantum Physics

25 pages, 8 figures

Scientific paper

10.1088/1367-2630/10/9/095015

The inherent coupling of optical and mechanical modes in high finesse optical microresonators provide a natural, highly sensitive transduction mechanism for micromechanical vibrations. Using homodyne and polarization spectroscopy techniques, we achieve shot-noise limited displacement sensitivities of 10^(-19) m Hz^(-1/2). In an unprecedented manner, this enables the detection and study of a variety of mechanical modes, which are identified as radial breathing, flexural and torsional modes using 3-dimensional finite element modelling. Furthermore, a broadband equivalent displacement noise is measured and found to agree well with models for thermorefractive noise in silica dielectric cavities. Implications for ground-state cooling, displacement sensing and Kerr squeezing are discussed.

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