Acousto-optic ptychography

Acousto-optic imaging (AOI) enables optical-contrast imaging deep inside scattering samples via localized ultrasoundmodulation of scattered light. While AOI allows optical investigations at depths, its imaging resolution is inherently limited by the ultrasound wavelength, prohibiting microscopic investigations. Here, we propose a computational imaging approach that allows optical diffraction-limited imaging using a conventional AOI system. We achieve this by extracting diffraction-limited imaging information from speckle correlations in the conventionally detected ultrasound-modulated scattered-light fields. Specifically, we identify that since "memory-effect"speckle correlations allowestimation of the Fourier magnitude of the field inside the ultrasound focus, scanning the ultrasound focus enables robust diffraction-limited reconstruction of extended objects using ptychography (i.e., we exploit the ultrasound focus as the scanned spatial-gate probe required for ptychographic phase retrieval). Moreover, we exploit the short speckle decorrelation-Time in dynamic media, which is usually considered a hurdle for wavefront-shaping-based approaches, for improved ptychographic reconstruction.We experimentally demonstrate noninvasive imaging of targets that extend well beyond the memory-effect range, with a 40-Times resolution improvement over conventional AOI.