A broadband all-optical ultrasound transducer has been designed, fabricated, and tested for high-resolution ultrasound imaging. It consists of a two-dimensional gold nanostructure on a glass substrate, followed by a 3 μm polydimethylsiloxane layer and a 30 nm gold layer. The signal to noise ratio of a pulse-echo signal is over 10 dB in the far field of the transducer, where the center frequency is 40 MHz with -6 dB bandwidth of 57 MHz. The potential for high-frequency ultrasound arrays using this technology is demonstrated using multiple measurements from the transducer to image a 25 μm diameter wire.
Bibliographical noteFunding Information:
This work is supported in part by NIH under Grant Nos. EB003455, EB003449, and EB004933. The author thank the Resource Center for Medical Ultrasonic Transducer Technology at the University of Southern California for supplying the high-frequency piezoelectric transducers.
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