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Ultrahigh-sensitive temperature sensor based on modal interference in a metal-under-clad ridge waveguide with a

Ranjeet Dwivedi, Arun Kumar

    Applied Optics
    |October 20, 2017
    PubMed
    Summary

    We developed a novel temperature sensor using a metal-under-clad ridge waveguide (MUCRW). This sensor achieves ultrahigh sensitivity for precise temperature monitoring, setting a new record for integrated optic waveguide sensors.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Sensing Technology

    Background:

    • Accurate temperature sensing is crucial across various scientific and industrial fields.
    • Existing integrated optic waveguide sensors face limitations in sensitivity and performance.

    Purpose of the Study:

    • To propose and demonstrate a highly sensitive temperature sensor based on modal interference.
    • To investigate the performance of a metal-under-clad ridge waveguide (MUCRW) for temperature sensing applications.

    Main Methods:

    • Utilizing modal interference between fundamental and first higher-order TE modes in a MUCRW.
    • Employing polydimethylsiloxane (PDMS) as the upper cladding material.
    • Analyzing the impact of temperature variations on modal characteristics.

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    Main Results:

    • Achieved an ultrahigh sensitivity of 8.35 nm/°C, the highest reported for integrated optic waveguide sensors.
    • Observed a significant change in modal characteristics due to the metal under-cladding and PDMS's thermo-optic properties.
    • Demonstrated a more pronounced temperature effect on the higher-order mode.

    Conclusions:

    • The proposed MUCRW sensor offers unprecedented sensitivity for temperature detection.
    • The unique design leveraging modal interference and material properties enables superior sensing performance.
    • This technology holds potential for advanced temperature monitoring in diverse applications.