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    We developed a low-cost near-infrared (NIR) micro-spectrometer using a novel flame retardant 4 (FR4)-driven micro-grating. This cost-effective device offers reliable spectral dispersion and spatial scanning for various applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Micro-engineering

    Background:

    • Conventional micro-spectrometers often rely on expensive and fragile silicon microelectromechanical systems (MEMS).
    • There is a need for cost-effective, robust alternatives for spectral analysis in the near-infrared (NIR) range.

    Purpose of the Study:

    • To introduce a novel FR4-driven micro-grating for spectral dispersion and spatial scanning in a low-cost NIR micro-spectrometer.
    • To evaluate the performance of this new micro-grating as a potential alternative to traditional MEMS gratings.

    Main Methods:

    • Fabrication of a micro-grating by directly bonding a silicon blazed grating onto an FR4 actuator platform.
    • Integration of a differential electromagnetic angle sensor for precise spatial scanning.
    • Assembly of a micro-spectrometer prototype utilizing the FR4-driven micro-grating.

    Main Results:

    • The developed micro-spectrometer prototype operates in the 800-1800 nm spectral range.
    • Achieved spectral accuracy of ±1.3 nm and a spectral resolution of 10 nm.
    • The FR4-driven micro-grating demonstrated superior shock and vibration reliability compared to conventional MEMS gratings.

    Conclusions:

    • The FR4-driven micro-grating offers a promising low-cost, reliable alternative for NIR micro-spectrometer applications.
    • The device exhibits a shorter fabrication cycle and lower cost, making it suitable for wider adoption.
    • This technology has the potential to replace conventional silicon MEMS scanning micro-gratings.