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Optical micro mechanical accelerometer with double grating: design and simulation.

Yu Zhang, Honghao Ma

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    |September 14, 2023
    PubMed
    Summary

    This study presents a novel optical micro-mechanical accelerometer using a double-grating and differential detection structure. This design significantly enhances the optical scale factor for improved acceleration measurement resolution.

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    Area of Science:

    • Optoelectromechanical Systems
    • Micro-electromechanical Systems (MEMS)
    • Optical Sensing Technologies

    Background:

    • Optical micro-mechanical accelerometers offer high sensitivity but often face limitations in optical scale factor.
    • Enhancing the optical scale factor is crucial for improving the resolution and performance of these devices.
    • Existing single-side detection structures have limitations in maximizing signal output.

    Purpose of the Study:

    • To develop and analyze a double-grating-based optical micro-mechanical accelerometer with a differential detection structure.
    • To theoretically enhance the optical scale factor for higher resolution acceleration sensing.
    • To provide a fabrication flow for micro-opto-electro-mechanical systems (MOEMS).

    Main Methods:

    • Establishment of a theoretical model based on the multi-slits Fraunhofer diffraction model.
    • Utilizing a double-grating design with a differential detection structure.
    • Finite element simulation for analyzing mechanical sensitivity and natural frequency.

    Main Results:

    • The normalized optical scale factor was improved from 5.491E6 (single-side detection) to 10.98E6 (differential detection).
    • Achieved mechanical sensitivity of 4.04 nm/g and a natural frequency of 7756.8 Hz via simulation.
    • Demonstrated a novel scheme for high-resolution optical micro-mechanical accelerometers.

    Conclusions:

    • The differential detection structure in a double-grating optical accelerometer significantly boosts the optical scale factor.
    • The proposed design offers a promising pathway for developing high-resolution optical micro-mechanical accelerometers.
    • The presented micro-opto-electro-mechanical system fabrication flow serves as a valuable reference for optical sensor development.