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(Color online) Setup for combined UCA microbubble trapping, acoustical driving, and ultrahigh speed optical recordings. The laser beam is converted by the spatial light modulator (SLM) into a Laguerre-Gaussian mode; upon reflection on a dichroic mirror (DM), it enters the objective and is focused into the sample volume. The ultrasound beam overlaps the optical focal volume. Beam splitter (BS) enables two imaging modes: monitor mode on a CCD camera and imaging mode on the ultrahigh speed camera Brandaris . L: lenses.
(Color online) Three curves of a single bubble with an initial radius , insonified with an eight-cycle ultrasound burst at with an applied pressure of . The frame rate is . The solid line represents the amplitude of oscillations at the wall; the dash-dotted line is recorded with the bubble at a distance of from the wall. The radius-time curve of the same bubble repeated at the wall identical (dashed line) is identical to the first one, showing that repeated insonations have not altered the initial bubble properties.
(Color online) Radius-time curves taken at for two interacting bubbles. (a) curves of the two bubbles trapped at distance from each other and positioned away from the wall. The dashed curve 1 corresponds to bubble 1, the solid line 2a corresponds to bubble 2. (b) The dashed line 2b represents the curve of bubble 2 oscillating after bubble 1 has been released. The curve 2a is also plotted for comparison. White scalebar in pictures: .
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