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Minimizing cross-axis sensitivity in grating-based optomechanical accelerometers.

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    Summary
    This summary is machine-generated.

    This study addresses cross-axis sensitivity in optomechanical accelerometers. A modified symmetrical design significantly reduces this error, improving accuracy without sacrificing performance.

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    Area of Science:

    • Optomechanics
    • Sensor Technology
    • Mechanical Engineering

    Background:

    • Cross-axis sensitivity is a critical issue in high-performance single-axis optomechanical accelerometers.
    • This sensitivity, often due to asymmetric structural design, degrades accuracy and has not been systematically studied.

    Purpose of the Study:

    • To investigate the mechanisms and detrimental effects of cross-axis sensitivity in optomechanical accelerometers.
    • To propose and validate a modified design for reducing cross-axis sensitivity.

    Main Methods:

    • Theoretical analysis and numerical simulation of cross-axis sensitivity in mechanical and optical components.
    • Development of a modified optomechanical accelerometer design using double-side etching on SOI wafers.
    • Experimental characterization of the prototype's performance.

    Main Results:

    • Cross-axis sensitivity was found to decrease interference signal contrast, acceleration sensitivity, and introduce optical path differences.
    • The modified symmetrical design reduced cross-axis sensitivity from 28.28%/0.1g to 2.19%/0.1g.
    • Acceleration sensitivity (1162.45V/g) and resolution (1.325μg) were maintained.

    Conclusions:

    • A highly symmetrical structural design effectively suppresses cross-axis sensitivity in optomechanical accelerometers.
    • The proposed modification enhances accelerometer accuracy without compromising key performance metrics.
    • This research provides a viable solution for high-performance single-axis optomechanical accelerometer applications.