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    Area of Science:

    • Photonics
    • Integrated Optics
    • Nanotechnology

    Background:

    • Accurate temperature monitoring is crucial for lab-on-chip systems.
    • Conventional silicon optical temperature sensors have limited sensitivity.
    • Mach-Zehnder interferometers (MZIs) offer a platform for optical sensing.

    Purpose of the Study:

    • To develop a highly-sensitive optical temperature sensor.
    • To enhance the sensitivity of silicon-based temperature sensors.
    • To create a robust and easily fabricated temperature monitoring solution for integrated systems.

    Main Methods:

    • Design and fabrication of a Mach-Zehnder interferometer (MZI) on a silicon-on-insulator (SOI) platform.
    • Tailoring waveguide widths in MZI arms to achieve differential temperature sensitivities.
    • Experimental demonstration of the MZI temperature sensor's performance.

    Main Results:

    • Achieved an enhanced temperature sensitivity greater than 438 pm/°C.
    • Demonstrated a sensitivity over seven times higher than conventional silicon optical sensors (approx. 60 pm/°C).
    • Fabrication requires only a single mask and no polymer cladding, ensuring robustness.

    Conclusions:

    • The proposed MZI-based sensor offers significantly improved temperature sensitivity.
    • Its simple fabrication and robustness make it suitable for lab-on-chip applications.
    • This technology provides a valuable tool for precise temperature monitoring in integrated photonic systems.