Design and prediction of laser-induced damage threshold of CNT–PDMS optoacoustic transducer

• Published in: Ultrasonics Vol. 142; p. 107377
• Main Authors: Zhang, Tao, Yuan, Junru, Li, Jiapu, Li, Wenbo, Qin, Yijie, Ge, Xu, Ou-Yang, Jun, Yang, Xiaofei, Zhu, Benpeng
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.08.2024
• Subjects: CNT-PDMS; Laser-induced damage; Optoacoustic transducer; Thermal damage; Optoacoustic transducer; Laser-induced damage; CNT-PDMS; Thermal damage
• ISSN: 0041-624X; 1874-9968; 1874-9968
• DOI: 10.1016/j.ultras.2024.107377

•The study quantifys laser-induced damage threshold from a theoretical perspective.•The theoretical model for laser-induced damage of optoacoustic transducer is established.•The theoretical model provides a significant guidance for design and prediction of laser-induced damage threshold of optoacoustic transducer.•The study demonstrated that when the laser energy density was less than laser-induced damage threshold, the optoacoustic transducer worked stably for a long time. The optoacoustic transducer has emerged as a new candidate for medical ultrasound applications and attracts considerable attention. Optoacoustic diagnosis and treatment sometimes require high-intensity acoustic pressure, which is often accompanied by the problem of laser-induced damage. Addressing the laser-induced damage phenomenon from a theoretical perspective holds paramount importance. In this study, the theoretical model of laser-induced damage of the carbon nanotubes–polydimethylsiloxane (CNT–PDMS) composite optoacoustic transducer is established. It is found that this laser-induced damage belongs to thermal ablation damage. Furthermore, the correctness of this theory can be confirmed by experimental results. Most importantly, when the laser energy density is less than threshold value of laser energy density, the optoacoustic transducer can work stable for long time. These encouraging results demonstrate that this work can provide significant guidance for the exploration and utilization of optoacoustic transducers.