Abstract
We present a novel approach to generate arbitrary acoustic wavefronts using the optoacoustic effect on custom designed PDMS substrates. PDMS blocks are casted into the desired shape with a 3D-printed mold and coated with a layer of an optical absorber. Acoustic wavefront corresponding to the geometry of coated surface is generated by exposing this structure to nanosecond laser pulse (Nd:YAG, λ = 532 nm). For a spherical shell design, pressure pulses of amplitude up to 6.1 bar peak to peak and frequency >30 MHz could be generated. By utilizing other geometries, we focus the acoustic waves from different sections of the transmitter onto a single focal point at different time delay, thus permitting generation of double-peak acoustic pulse from a single laser pulse. Further modification of the structure permits designing of multi-foci, multi-peak acoustic pulses from a single optical pulse.
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