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    Area of Science:

    • Materials Science
    • Photonics
    • Sensor Technology

    Background:

    • Optical waveguide sensors offer potential for high sensitivity and flexibility.
    • Developing precise, localized pressure sensing remains a key challenge in smart materials.

    Purpose of the Study:

    • To design and fabricate a planar polymer optical waveguide sensor with an optimized four-core array.
    • To investigate the sensor's capability for precise pressure value and location detection.
    • To evaluate the performance and sensitivity of the fabricated sensor.

    Main Methods:

    • Utilized beam propagation method simulations for optimizing the waveguide geometry.
    • Employed UV-curable polydimethyl siloxane for cladding and UV-curable acrylate resin for the waveguide core.
    • Fabricated a four-core planar polymer optical waveguide sensor.
    • Conducted experiments to measure pressure-induced changes in output light intensity.

    Main Results:

    • Achieved precise sensing of pressure value and location through changes in output light intensity.
    • Demonstrated sensitivities for the four cores (Ch.1 to 4) ranging from 8.7 dB/MPa to 10.88 dB/MPa within a 0-1.13 MPa pressure range.
    • Proposed a 3D crossed core structure for future development.

    Conclusions:

    • The developed planar polymer optical waveguide sensor exhibits excellent flexibility and high sensitivity for pressure detection.
    • The sensor's design enables accurate localization of applied pressure.
    • Optical waveguide structures hold significant promise for flexible electronics and advanced smart sensing applications.