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Express"],"published-print":{"date-parts":[[2026,5,18]]},"abstract":"<jats:p>Microplastic pollution in aquatic environments demands field-ready tools that can rapidly detect and discriminate particles in complex aquatic environments. Here, we present a single-shot polarimetric off-axis lensless holographic imaging system integrated into a compact submersible prototype. The system combines a simple off-axis interferometric layout, requiring only one mirror and one beam splitter, with a division-of-focal-plane (DoFP) polarimetric sensor to acquire four polarization-resolved holograms per exposure, enabling Fourier-domain order isolation and complex-field recovery while preserving polarization-dependent contrast. 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