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Single-photon CASSI: towards ultralow-light spectral imaging.

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    This study introduces a novel single-photon coded aperture snapshot spectral imaging (CASSI) system using single-photon avalanche diodes (SPAD) for enhanced ultralow-light spectral imaging. The system achieves significant performance improvements in challenging imaging scenarios.

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    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Computational Imaging

    Background:

    • Spectral imaging is crucial for various applications but is limited in ultralow-light conditions.
    • Existing coded aperture snapshot spectral imaging (CASSI) systems face challenges with sparse spatial sampling and lack of specialized networks for low-light data.

    Purpose of the Study:

    • To develop a highly sensitive snapshot spectral imaging system for ultralow-light conditions.
    • To integrate single-photon avalanche diodes (SPAD) with the CASSI framework for improved spectral and spatial information capture.

    Main Methods:

    • Developed an efficient spectral-spatial model tailored for ultralow-light imaging.
    • Created a SPAD-CASSI simulation algorithm incorporating calibrated photon counts, noise, and spectral-spatial encoding.
    • Designed a deep learning network for spectral reconstruction from simulated SPAD-CASSI data.
    • Simulated data from 450-650 nm across 8 channels at 64x32 resolution with 100 µs exposure at 0.15 lux.

    Main Results:

    • The proposed SPAD-CASSI system demonstrates significantly improved performance in snapshot spectral imaging under ultralow-light conditions.
    • Experimental validation across macroscopic, microscopic, and high-speed scenarios confirmed the system's robustness.
    • The deep learning approach effectively reconstructed spectral information from sparse, noisy data.

    Conclusions:

    • The integrated SPAD-CASSI system offers a robust solution for spectral imaging in challenging ultralow-light environments.
    • This advancement opens new possibilities for applications requiring high sensitivity and spectral resolution in low-light settings.