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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Common-path off-axis single-pixel holographic imaging.

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    This summary is machine-generated.

    Common-path off-axis single-pixel holographic imaging (COSHI) offers a robust method for complex amplitude imaging. This technique reduces measurements and enhances space-bandwidth product compared to traditional digital holography.

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    Area of Science:

    • Optical Imaging
    • Holography
    • Metrology

    Background:

    • Conventional single-pixel digital holography is susceptible to environmental disturbances like vibrations.
    • Existing methods often require a large number of measurements for reconstruction.
    • Reconstruction of self-correlation terms limits the space-bandwidth product in traditional off-axis holography.

    Purpose of the Study:

    • To introduce a novel common-path off-axis single-pixel holographic imaging (COSHI) technique.
    • To demonstrate COSHI's improved robustness and efficiency for complex amplitude information acquisition.
    • To enhance the space-bandwidth product achievable with single-pixel holographic imaging.

    Main Methods:

    • Utilizes an in-line interferometer and a single-pixel detector for data acquisition.
    • Employs structured illumination patterns, including Hadamard basis patterns and tilted phase distributions.
    • Leverages Fourier fringe analysis for hologram reconstruction, reducing measurement requirements.

    Main Results:

    • COSHI exhibits superior robustness against vibrations due to its common-path configuration.
    • The Fourier fringe analysis based reconstruction significantly reduces the number of required measurements.
    • Achieves a larger space-bandwidth product by avoiding the reconstruction of the object's self-correlation term.

    Conclusions:

    • The proposed COSHI method provides a feasible and advantageous approach for complex amplitude holographic imaging.
    • COSHI overcomes key limitations of conventional single-pixel digital holography.
    • Theoretical, numerical, and experimental validations confirm the efficacy of the COSHI technique.