Photoacoustic mesoscopy is an emerging noninvasive imaging modality, which offers high resolution 3D images with optical absorption contrast at depths beyond the light diffusion limit. Ultrasound sensor based on a Fabry-Perot (FP) polymer cavity has the following advantages: broadband frequency response, wide angular coverage and small footprint. We present a photoacoustic mesoscope based on a tunable Fabry-Perot interferometer, which offers the potential for reducing system cost and making array of such sensor. A cw diode laser working at 650nm was used to heat the sensor, offering an active tune range of 5nm by elongating the cavity. Ex-vivo and in-vivo imaging experiments demonstrated the imaging capability of this PA mesoscope, showing great potential in biological and medical applications.
Yuwen Chen, Bohua Chen, and Cheng Ma, "Photoacoustic mesoscopy with lower cost: using photothermal tunable Fabry-Perot interferometric ultrasound sensor," Proc. SPIE 11553, Optics in Health Care and Biomedical Optics X, 115530L (Presented at SPIE/COS Photonics Asia: October 12, 2020; Published: 10 October 2020); https://doi.org/10.1117/12.2574025.6196241517001.
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