Abstract

Aiming to address existing technical challenges and explore a simple yet effective and universal solution for making a polydimethylsiloxane (PDMS)-based focused photoacoustic transmitter, a novel fabrication strategy is proposed. Different from the traditional technical route based on direct photoacoustic layer coating on a rigid concave substrate, it works by utilizing an elastomeric molding process, through which the originally flat photoacoustic conversion layer, consisting of PDMS-candle soot nanoparticles/PDMS-PDMS composite, is transformed into a concave contour with controllable radius of curvature and finally merged into a soft PDMS substrate. For proof-of-concept demonstration, two types of focused photoacoustic transmitters (6.3 mm and 8 mm focal lengths) operating at 5.3 MHz with $-6\mathrm{dB}$ bandwidth of 134% are successfully fabricated, showing both distinct acoustic focusing capability and high energy conversion efficiency. Moreover, different from conventional focused counterparts, acoustic signals with nearly symmetric bi-polar waveform can be obtained at the focuses, facilitating ultrasound cavitation-based applications.

© 2019 Optical Society of America

Air-backed photoacoustic transmitter for significantly improving negative acoustic pressure output

Yujie Chen, Qi Li, Haobo Zhu, Yan Wang, Xinyue Zhang, and Hongbin Yu
Opt. Lett. 46(5) 1149-1152 (2021)

Versatile and scalable fabrication method for laser-generated focused ultrasound transducers

E. Aytac-Kipergil, E. J. Alles, H. C. Pauw, J. Karia, S. Noimark, and A. E. Desjardins
Opt. Lett. 44(24) 6005-6008 (2019)

Miniature fiber-optic high-intensity focused ultrasound device using a candle soot nanoparticles-polydimethylsiloxane composites-coated photoacoustic lens

Yao Li, Zhendong Guo, Guangyao Li, and Sung-Liang Chen
Opt. Express 26(17) 21700-21711 (2018)

Binary amplitude switch for photoacoustic transducer toward dynamic spatial acoustic field modulation

Yujie Chen, Haobo Zhu, Yan Wang, and Hongbin Yu
Opt. Lett. 47(4) 738-741 (2022)

MXene-based photoacoustic transducer with a high-energy conversion efficiency

Heliang Wu, Zizhong Guan, Yuan Ke, Xiong Yu, Zheng Zhang, Mingyu Li, and Haifei Lu
Opt. Lett. 48(21) 5563-5566 (2023)