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Jie Fang

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Proceedings Article | 9 March 2023 Poster + Paper

An optically transparent focused P(VDF-TrFE) transducer for Photoacoustic Microscopy (PAM)

Cheng Fang, Zijie Zhao, Jie Fang, Jun Zou

Proceedings Volume 12379, 123791E (2023) https://doi.org/10.1117/12.2648118

KEYWORDS: Transducers, Acoustics, Glasses, Ferroelectric polymers, Spherical lenses, Fabrication, Electrodes, Ultrasound transducers, Photoacoustic microscopy, Transmittance

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This paper reports a new optically transparent focused P(VDF-TrFE) (poly(vinylidene fluoride-co-trifluoroethylene)) transducer for photoacoustic microscopy (PAM), which is fabricated by a new process based on pre-cutting and direct-lamination. Compared with the previous fabrication process, it is simpler, and makes it possible to achieve a high numerical aperture (NA) without stretching the (brittle) piezoelectric film. For demonstration, a prototype transducer has been fabricated with a 10-μm-thick 70/30 P(VDF-TrFE) film laminated onto a plano-concave glass lens with an NA of 0.64. Experimental characterization shows that the transducer has an optical transmittance of 88.6% (@ 532 nm), an acoustic center frequency and -3 dB bandwidth of 24 MHz and 29 MHz, respectively. Using the new optically transparent focused P(VDF-TrFE) transducer, an optical-resolution PAM (OR-PAM) imaging setup has been built and imaging experiments have been conducted on different targets. The experimental results show the optically transparent focused P(VDF-TrFE) transducer could be useful for the development of new PAM systems for different imaging applications.

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