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A nonintrusive three-dimensional trap for microscopic particles in a liquid is described. The trap is based on acoustic radiation forces in an ultrasonic confocal standing-wave cavity. Experiments at 11 MHz demonstrate the concept and verify the theoretically calculated forces. Theoretical calculations for higher-frequency systems indicate a significant potential for low-rms-displacement trapping of submicrometer particles, making the trap suitable for nonintrusive scanning near-field optical microscopy.
Hans M. Hertz (Sun,) studied this question.
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