An all-optical, forward-viewing, optical-resolution photoacoustic endomicroscopy probe was developed for guiding minimally invasive procedures. The probe comprises a multimode fibre for the delivery of excitation laser via wavefront shaping, and a fibre-optic ultrasound sensor based on a plane-concave microresonator at the tip of a single-mode fibre. High-resolution photoacoustic microscopy images of mouse red blood cells and mouse ear vasculature were acquired, and the high scalability of the probe in terms of field-of-view and spatial resolution was demonstrated. The ultrathin photoacoustic endomicroscopy probe promises to guide minimally invasive surgery by providing both molecular and microstructural information.
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