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Related Experiment Video

Updated: Apr 3, 2026

Fabrication and Testing of Photonic Thermometers
08:44

Fabrication and Testing of Photonic Thermometers

Published on: October 24, 2018

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On-chip silicon waveguide Bragg grating photonic temperature sensor.

Nikolai N Klimov, Sunil Mittal, Michaela Berger

    Optics Letters
    |September 15, 2015
    PubMed
    Summary
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    A new photonic thermometer using silicon waveguides and Bragg gratings accurately measures temperature from 5°C-160°C. This optical sensor offers a precise alternative to traditional resistance thermometry for various applications.

    Area of Science:

    • Photonics
    • Optical Sensing
    • Materials Science

    Background:

    • Traditional resistance thermometry faces fundamental limitations.
    • Photonic temperature sensors are emerging as a promising alternative.
    • Silicon photonics offers a robust platform for integrated optical devices.

    Purpose of the Study:

    • To demonstrate a novel photonic thermometer for accurate temperature measurement.
    • To evaluate the performance of a silicon waveguide integrated with a Bragg grating for sensing.
    • To compare experimental results with computational modeling predictions.

    Main Methods:

    • Fabrication of a silicon waveguide with an integrated Bragg grating.
    • Experimental measurement of temperature changes from 5°C to 160°C.

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  • Utilizing optical resonance shifts to determine temperature.
  • Computational modeling to predict sensor performance.

    • Main Results:

    • The photonic thermometer successfully measured temperature over the 5°C-160°C range.
    • Achieved a combined expanded uncertainty of 1.25°C (k=2, 95% confidence level).
    • Computational models accurately predicted resonance wavelength and effective refractive index within 4% of measured values.

    Conclusions:

    • The developed photonic thermometer provides a viable and accurate alternative to resistance thermometry.
    • Silicon waveguide Bragg gratings are effective components for optical temperature sensing.
    • The sensor demonstrates high precision and reliability for temperature monitoring applications.