The design of optofluidic systems involves the provision of control and sensing mechanisms for both optical and fluid flow. In many cases, this is accomplished by mechanical or electrical transducers. Here we show that all optical transduction may be achieved by the use of optical tweezers. We demonstrate (1) The use of optically trapped microspheres to tune the transmission properties of embedded fiber optic waveguides; (2) The use of optical tweezers for optical actuation of cantilevers for use as switches and sensors.
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