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

Matt Eichenfield·Christopher P. Michael·Raviv Perahia·Oskar Painter
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Abstract

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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Matt Eichenfield, Christopher P. Michael, Raviv Perahia, Oskar Painter. 2007-04-30. Actuation of Micro-Optomechanical Systems Via Cavity-Enhanced Optical Dipole Forces. https://doi.org/10.1038/nphoton.2007.96

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