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Writing Bragg Gratings in Multicore Fibers
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Temperature sensor based on multi-layer MoS2 coated etched fiber Bragg grating.

S Sridhar, Suneetha Sebastian, S Asokan

    Applied Optics
    |January 30, 2019
    PubMed
    Summary
    This summary is machine-generated.

    A novel etched fiber Bragg grating (eFBG) temperature sensor coated with molybdenum disulfide (MoS2) shows significantly enhanced sensitivity. This MoS2-coated sensor achieves a near order of magnitude higher temperature sensitivity compared to bare FBGs.

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    Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Optical Sensors

    Background:

    • Fiber Bragg gratings (FBGs) are widely used optical sensors.
    • Enhancing the sensitivity of FBGs for temperature sensing is crucial for various applications.
    • Molybdenum disulfide (MoS2) is a 2D material with unique optical and electronic properties.

    Purpose of the Study:

    • To develop a highly sensitive temperature sensor using etched fiber Bragg gratings (eFBGs) coated with multi-layer molybdenum disulfide (MoS2).
    • To investigate the effect of MoS2 coating thickness on the temperature sensitivity of eFBGs.
    • To achieve a high-resolution temperature sensing capability.

    Main Methods:

    • Fabrication of clad etched fiber Bragg grating (eFBG) sensors.
    • Coating of multi-layer MoS2 onto eFBGs using DC magnetron sputtering of molybdenum followed by sulfurization.
    • Characterization of temperature sensitivity and resolution of MoS2-coated eFBGs from room temperature to 100°C.

    Main Results:

    • MoS2 coating significantly enhances the temperature sensitivity of eFBGs.
    • A MoS2 coating thickness of approximately 10 nm yielded maximum temperature sensitivity of ~95 pm/°C.
    • A high resolution of ~0.01°C was achieved using an FBG interrogator with 1 pm resolution.

    Conclusions:

    • The developed MoS2-coated eFBG sensor demonstrates a significant improvement in temperature sensitivity, almost an order of magnitude higher than bare FBGs.
    • The MoS2 coating thickness is a critical parameter for optimizing sensor performance.
    • This technology offers a promising solution for high-resolution temperature sensing applications.