Ultrasonic micromanipulation of small particles in liquid using VHF-range leaky wave transducers
- 1 January 1994
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 1, 607-610 vol.1
- https://doi.org/10.1109/ultsym.1994.401660
Abstract
New ultrasonic micromanipulation techniques for small particles based on the radiation forces of high-frequency ultrasound are proposed, using VHF-range leaky wave transducers. A newly developed leaky wave transducer with beamwidth compression consists of a floating-electrode-type unidirectional interdigital transducer and a LiNbO3 substrate. It has many advantages: no impedance matching scheme between liquid and substrate, efficient generation of higher-frequency ultrasonic waves into a small-scale liquid system, and isolation of interdigital electrodes from liquid. The experimental leaky wave transducer with narrow beam width of 120-μm shows a conversion loss of 5.8 dB at 97.5 MHz. Transportation and trapping of 50-μm-diameter glass spheres in water are confined by preliminary experiments in the frequency range of 50 to 100 MHzKeywords
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