Dynamic acoustic focusing in photoacoustic transmitter.

Autor:	Li Q; School of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China., Li J; School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China., Zhu H; School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China., Chen Y; School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China., Zhu B; School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.; Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China., Yu H; School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.; Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
Jazyk:	angličtina
Zdroj:	Photoacoustics [Photoacoustics] 2020 Nov 28; Vol. 21, pp. 100224. Date of Electronic Publication: 2020 Nov 28 (Print Publication: 2021).
DOI:	10.1016/j.pacs.2020.100224
Abstrakt:	Photoacoustic transmitter represents a promising substitute for conventional piezoelectric counterparts. However, lack of easy and effective method for dynamically manipulating the focused acoustic field is a common and tricky problem faced by current photoacoustic technology. In this paper, a new strategy for constructing focus tunable photoacoustic transmitter is proposed. Different from existed prevailing device architecture, a sandwich like photoacoustic conversion layer is innovatively designed into a suspending elastic membrane with clamped boundary and it can be deformed using integrated pneumatic actuator. Owing to the membrane deflection property, concave spherical contours with variable radius of curvature can be obtained. Considering the shape determined sound emission characteristic, continuous tuning on the axial focusing length of the acoustic field has been successfully demonstrated in the photoacoustic transmitter for the first time. Besides, acoustic signal with significantly improved negative pressure has also been achieved especially at the focus, bringing additional advantage for applications. Competing Interests: The authors report no declarations of interest. (© 2020 The Authors.)
Databáze:	MEDLINE
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