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 formilliwatt(mW)-level optical input powers. Measurement of the spatial variationof the force on the waveguide indicates that it arises from a cavity-enhancedoptical dipole force due to the stored optical field of the resonator. Thisforce is used to realize an all-optical tunable filter operating with sub-mWcontrol power. A theoretical model of the system shows the maximum achievableforce to be independent of the intrinsic Q of the optical resonator and toscale inversely with the cavity mode volume, suggesting that such forces maybecome even more effective as devices approach the nanoscale.
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