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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Rapid single-pixel autofocus using a single Fourier modulation pattern.

Huiling Chen, Kaixin Yin, Dongfeng Shi

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    |November 11, 2025
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    Summary
    This summary is machine-generated.

    A novel single-pixel autofocus (AF) method uses a single Fourier-Basis modulation (SFBM) pattern for rapid, accurate focusing. This non-imaging technique simplifies hardware and computation, excelling in challenging low-light conditions.

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    Area of Science:

    • Optical Engineering
    • Image Processing
    • Sensor Technology

    Background:

    • Conventional autofocus (AF) systems utilize multi-pixel sensors and sharpness metrics.
    • Performance limitations exist in low-illumination, low-contrast, and cost-sensitive applications.

    Purpose of the Study:

    • To introduce a non-imaging, single-pixel AF technique using Fourier-Basis modulation.
    • To demonstrate a simplified, high-speed autofocus solution.

    Main Methods:

    • Employs a single Fourier-Basis modulation (SFBM) pattern to probe optical systems.
    • Utilizes a single-pixel detector for defocus detection without image reconstruction.
    • Leverages the sensitivity of a single spatial frequency to defocus.

    Main Results:

    • Achieved a focusing rate of 500 kHz, exceeding digital micromirror device (DMD) limits.
    • Demonstrated effective operation in low-light, broadband, and terahertz conditions.
    • Significantly simplified hardware and computational requirements.

    Conclusions:

    • The SFBM-AF scheme offers a compact, high-speed alternative to traditional image-based AF.
    • Suitable for diverse optical applications requiring robust and efficient autofocusing.