Nonlinear cavity optomechanics with nanomechanical thermal fluctuations
arXiv:1612.08072 · doi:10.1038/ncomms16024
Abstract
The inherently nonlinear interaction between light and motion in cavity optomechanical systems has experimentally been studied in a linearized description in all except highly driven cases. Here we demonstrate a nanoscale optomechanical system, in which the interaction between light and motion is so large (single-photon cooperativity ) that thermal motion induces optical frequency fluctuations larger than the intrinsic optical linewidth. The system thereby operates in a fully nonlinear regime, which pronouncedly impacts the optical response, displacement measurement, and radiation pressure backaction. Experiments show that the apparent optical linewidth is dominated by thermomechanically-induced frequency fluctuations over a wide temperature range. The nonlinearity induces breakdown of the traditional cavity optomechanical descriptions of thermal displacement measurements. Moreover, we explore how radiation pressure backaction in this regime affects the mechanical fluctuation spectra. The strong nonlinearity could serve as a resource to control the motional state of the resonator. We demonstrate the use of highly nonlinear transduction to perform a quadratic measurement of position while suppressing linear transduction.
26 pages, 10 figures
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