There has been considerable interest in extending photoacoustic imaging techniques to endoscopic devices, which would enable a diverse range of applications, e.g. assessment of coronary artery disease or surgical guidance.
However, the difficulty of miniaturising traditional piezoelectric sensors has mostly prevented tomography-mode endoscopic imaging, where an array of sensors is used to reconstruct the full ultrasound field to centimeter-scale depths.
In this work we demonstrate how wavefront shaping through multimode fibres onto a Fabry-Perot optical ultrasound sensor can overcome this limitation, producing an endoscopic imaging system with a footprint an order of magnitude smaller than the state of the art.
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