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Near single-photon imaging in the shortwave infrared using homodyne detection.

O WolleyS MekhailP-A MoreauT GregoryGraham M GibsonGerd LeuchsM J Padgett
Published in: Proceedings of the National Academy of Sciences of the United States of America (2023)
Low-light imaging is challenging in regimes where low-noise detectors are not yet available. One such regime is the shortwave infrared where even the best multipixel detector arrays typically have a noise floor in excess of 100 photons per pixel per frame. We present a homodyne imaging system capable of recovering both intensity and phase images of an object from a single frame despite an illumination intensity of ≈ ​ 1 photon per pixel. We interfere this weak signal which is below the noise floor of the detector with a reference beam that is ∼ ​ 300 ,   000 times brighter, record the resulting interference pattern in the spatial domain on a detector array, and use Fourier techniques to extract the intensity and phase images. We believe our approach could vastly extend the range of applications for low-light imaging by accessing domains where low-noise cameras are not currently available and for which low-intensity illumination is required.
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