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Related Experiment Video

Updated: Jan 3, 2026

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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Ultra-thin near infrared camera enabled by a flat multi-level diffractive lens.

Sourangsu Banerji, Monjurul Meem, Apratim Majumder

    Optics Letters
    |November 16, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a compact, millimeter-thick near-infrared camera using a diffractive lens and image sensor. This innovative design enables high-performance imaging in a reduced form factor for various applications.

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    Area of Science:

    • Optics
    • Imaging Technology
    • Sensor Development

    Background:

    • Traditional near-infrared (NIR) cameras often have bulky designs.
    • Miniaturization of imaging systems is crucial for portable and integrated applications.

    Purpose of the Study:

    • To demonstrate a novel, ultra-thin NIR camera design.
    • To characterize the performance of a diffractive lens-based NIR camera.

    Main Methods:

    • Experimental setup combining a multi-level diffractive lens with a monochrome image sensor.
    • Characterization of optical performance including point-spread function (PSF) and modulation transfer function (MTF).
    • Evaluation of focusing efficiency, aberrations, and field of view (FOV).

    Main Results:

    • Successful demonstration of a camera with a thickness of approximately 1 mm.
    • Comprehensive optical performance metrics were measured and analyzed.
    • The diffractive lens effectively coupled with the image sensor for NIR imaging.

    Conclusions:

    • A compact and efficient NIR camera is achievable using diffractive optics.
    • The demonstrated technology offers a pathway to miniaturized NIR imaging systems.
    • Further optimization could enhance performance for specific applications.