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Related Concept Videos

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Lensless Fluorescent Microscopy on a Chip
11:23

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Published on: August 17, 2011

Apodized pixel lenses in compact shadow-casting correlators.

K Raj, R A Athale

    Applied Optics
    |November 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a compact shadow-casting correlator for efficient 2D signal processing. Apodized pixel lenses overcome geometric constraints, enhancing signal-to-noise ratio for improved optical correlation performance.

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    08:41

    Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

    Published on: August 16, 2012

    Area of Science:

    • Optics
    • Optical Engineering
    • Signal Processing

    Background:

    • Traditional optical correlators face limitations in input size and light efficiency.
    • Geometric optics constraints can restrict the performance of shadow-casting systems.

    Purpose of the Study:

    • To develop a compact two-dimensional shadow-casting correlator with improved performance.
    • To overcome geometric constraints in optical correlation using novel optical elements.

    Main Methods:

    • Utilizing a two-dimensional array of steerable, mutually incoherent sources to encode the point-spread function.
    • Implementing apodized pixel lenses in the input spatial light modulator to manage shadow planes.
    • Employing pixel apodization to minimize interchannel cross talk.

    Main Results:

    • Successfully performed correlation between 256x256 inputs and 32x32 point-spread functions.
    • Demonstrated improved light uniformity and utilization efficiency through source steering.
    • Verified enhanced signal-to-noise ratio via simulation and experimental results.

    Conclusions:

    • The compact shadow-casting correlator effectively addresses geometric constraints.
    • Apodized pixel lenses are crucial for improving signal-to-noise ratio in optical correlators.
    • The developed system offers a promising approach for advanced optical signal processing.