Actuation of Micro-Optomechanical Systems Via Cavity-Enhanced Optical Dipole Forces

Details Actuation of Micro-Optomechanical Systems Via Cavity-Enhanced Optical Dipole Forces Actuation of Micro-Optomechanical Systems Via Cavity-Enhanced Optical Dipole Forces

2007-02-26

arxiv.org/abs/physics/0702231v3

Physics

Optics

4 pages, 5 figures. High resolution version available at (http://copilot.caltech.edu/publications/CEODF_hires.pdf). For associ

Scientific paper

We demonstrate a new type of optomechanical system employing a movable, micron-scale waveguide evanescently-coupled to a high-Q optical microresonator. Micron-scale displacements of the waveguide are observed for milliwatt(mW)-level optical input powers. Measurement of the spatial variation of the force on the waveguide indicates that it arises from a cavity-enhanced optical dipole force due to the stored optical field of the resonator. This force is used to realize an all-optical tunable filter operating with sub-mW control power. A theoretical model of the system shows the maximum achievable force to be independent of the intrinsic Q of the optical resonator and to scale inversely with the cavity mode volume, suggesting that such forces may become even more effective as devices approach the nanoscale.

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