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Fabrication and Testing of Photonic Thermometers
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Temperature compensation of optical microresonators using a surface layer with negative thermo-optic coefficient.

Ming Han1, Anbo Wang

  • 1Bradley Department of Electrical and Computer Engineering, Center for Photonics Technology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0111, USA. mhan@vt.edu

Optics Letters
|July 3, 2007
PubMed
Summary

A novel surface layer can fully compensate thermal drift in optical microresonators. This research explores using materials with negative thermo-optic coefficients for stable resonant frequencies in optical devices.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Optical microresonators are sensitive to temperature fluctuations.
  • Thermal drift affects the resonant frequency, limiting device stability and performance.
  • Whisper-gallery modes are particularly susceptible to thermal variations.

Purpose of the Study:

  • To theoretically investigate the feasibility of using a surface layer to compensate thermal drift in optical microresonators.
  • To demonstrate full compensation of resonant frequency thermal drift in a fused-silica microsphere.
  • To analyze and compare the performance of different surface layer materials for thermal compensation.

Main Methods:

  • Theoretical analysis of optical microresonator thermal behavior.
  • Modeling the effect of a surface layer with a negative thermo-optic coefficient.

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  • Simulations using a fused-silica microsphere as a model system.
  • Comparative analysis of various materials for the surface layer.

    • Main Results:

    • A surface layer with a negative thermo-optic coefficient can fully compensate the thermal drift of a resonant frequency.
    • The proposed compensation method is effective for whisper-gallery modes in a fused-silica microsphere.
    • Different surface layer materials exhibit varying degrees of compensation performance.

    Conclusions:

    • It is feasible to use a surface layer with a negative thermo-optic coefficient to stabilize optical microresonator frequencies.
    • This approach offers a promising solution for enhancing the thermal stability of optical micro-devices.
    • Material selection for the surface layer is crucial for optimizing thermal drift compensation.