Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

A Miniature Multi-Functional Photoacoustic Probe

Riqiang Lin
,
Jiaming Zhang
ORCID logo ,
Wen Gao
,
Xiatian Wang
,
Shengmiao Lv
,
Kwok-ho Lam
* ORCID logo ,
Xiaojing Gong
*
Version 1 : Received: 9 May 2023 / Approved: 10 May 2023 / Online: 10 May 2023 (05:12:04 CEST)

A peer-reviewed article of this Preprint also exists.

Lin, R.; Zhang, J.; Gao, W.; Wang, X.; Lv, S.; Lam, K.-H.; Gong, X. A Miniature Multi-Functional Photoacoustic Probe. Micromachines 2023, 14, 1269. Lin, R.; Zhang, J.; Gao, W.; Wang, X.; Lv, S.; Lam, K.-H.; Gong, X. A Miniature Multi-Functional Photoacoustic Probe. Micromachines 2023, 14, 1269.

Abstract

Photoacoustic technology is a promising tool to provide morphological and functional information in biomedical research. To enhance the imaging efficiency, the reported photoacoustic probes have been designed coaxially involving complicated optical/acoustic prisms to bypass the opaque piezoelectric layer of ultrasound transducers, but leading to bulky probes and hindering the applications in limited space. Though the emergence of transparent piezoelectric materials helps to save the effort on the coaxial design, the reported transparent ultrasound transducers were still bulky. In this work, a miniature photoacoustic probe with an outer diameter of 4 mm was developed, in which an acoustic stack was made of the combination of transparent piezoelectric material and gradient-index lens as a backing layer. The transparent ultrasound transducer exhibited a high center frequency of ~47 MHz and a -6 dB bandwidth of 29.4%, which could be easily assembled with a pigtailed ferrule of a single-mode fiber. The multi-functional capability of the probe was successfully validated through the experiments of fluid flow sensing and photoacoustic imaging.

Keywords

Miniature probe; Transparent ultrasound transducer; GRIN lens backing; OR-PAM.

Subject

Engineering, Other

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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