Acoustic trapping in bubble-bounded micro-cavities
نویسنده
چکیده
We present a method for controllably producing longitudinal acoustic trapping sites insidemicrofluidic 5 channels. Air bubbles are injected into amicro-capillary to create bubble-bounded ‘micro-cavities’. A cavity mode is formed that shows controlled longitudinal acoustic trapping between the two air/water interfaces along with the levitation to the centre of the channel that one would ex10 pect from a lower order lateral mode. 7 μm and 10 μm microspheres are trapped at the discrete acoustic trapping sites in these micro-cavities. We show this for several lengths of micro-cavity.
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