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Asymmetrical optical microcavity structures for dynamic pressure sensing: design, fabrication, validation.

Gyuhyon Lee, David A Scripka, Zhitao Kang

    Optics Express
    |November 10, 2016
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    Summary

    This study optimized asymmetrical optical microcavities (AOMCs) for dynamic pressure sensing. A stable AOMC structure demonstrated a fast response, showing potential for high-speed pressure detection.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Mechanical Engineering

    Background:

    • Optical microcavities (OMCs) possess spectral properties sensitive to physical dimensions and refractive indices.
    • Their rapid optical response to mechanical changes makes OMCs suitable for dynamic sensing applications.
    • Asymmetrical OMCs (AOMCs) offer tunable properties for advanced sensing.

    Purpose of the Study:

    • To investigate and optimize AOMC designs and fabrication processes for dynamic sensing.
    • To assess the feasibility of AOMCs for high-speed mechanical measurements.
    • To evaluate the impact of structural and material properties on AOMC performance.

    Main Methods:

    • Fabrication of various AOMC structures with different materials and designs.
    • Characterization of spectral properties, structural stability, and fabrication processes.
    • Testing AOMC response under dynamic compressive loading using streak camera and spectrograph.

    Main Results:

    • An AOMC with a SiO2 cavity and Ag mirrors, supported by Al2O3 adhesion layers, showed optimal structural stability and spectral characteristics.
    • The optimized AOMC exhibited a 22 nm blueshift under ~4 GPa dynamic compressive load.
    • A rapid temporal response time of less than 3.3 ns was achieved.

    Conclusions:

    • The optimized AOMC structure demonstrates excellent structural integrity and spectral performance.
    • AOMC-based sensors exhibit significant potential for high-speed, dynamic pressure sensing applications.
    • This research paves the way for novel optical sensing technologies in demanding environments.