HIGHLIGHTS
SUMMARY
As the intensity of the ultrasound emission scales with the size of the piezoelectrical element, the strength of the ultrasound emitted from the submillimeter piezoelectric transmitter can hardly satisfy the practical need for efficient therapy and also pose a stringent sensitivity requirement of the ultrasound receiver for biological imaging. Those PA-effect-based fiber-optic ultrasound transmitters required the use of expensive high-energy pulsed lasers to increase the ultrasound intensity and large core optical fibers to avoid the optical damage of the fiber enface caused by the high-energy laser pulse. For imaging . . .
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