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Temperature-independent silicon subwavelength grating waveguides.

J H Schmid1, M Ibrahim, P Cheben

  • 1Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada. jens.schmid@nrc‐cnrc.gc.ca

Optics Letters
|June 3, 2011
PubMed
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We developed temperature-independent subwavelength grating waveguides using silicon and SU-8 polymer. This innovation significantly reduces the thermo-optic (TO) effect, crucial for stable photonic devices.

Area of Science:

  • Photonics
  • Materials Science
  • Waveguide Technology

Background:

  • Silicon photonics offers high performance but suffers from significant thermo-optic (TO) effects, limiting device stability.
  • Conventional waveguides show a large TO coefficient, causing performance drift with temperature changes.
  • Developing temperature-stable photonic components is critical for reliable optical systems.

Purpose of the Study:

  • To demonstrate temperature-independent subwavelength grating waveguides.
  • To investigate the cancellation of the thermo-optic effect in composite core waveguides.
  • To explore the impact of duty ratios on waveguide temperature dependence.

Main Methods:

  • Experimental fabrication of subwavelength grating waveguides with alternating silicon and SU-8 polymer core regions.

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  • Numerical calculations using Bloch mode analysis.
  • Measurements of the thermo-optic coefficient at a wavelength of 1550 nm across various silicon-polymer duty ratios.

    • Main Results:

    • Achieved temperature-independent subwavelength grating waveguides.
    • Demonstrated a composite core design where the negative TO coefficient of SU-8 polymer cancels the positive TO effect of silicon.
    • Measured a lowest TO coefficient of 1.8×10⁻⁶ K⁻¹, which is 2 orders of magnitude smaller than conventional silicon photonic wire waveguides.
    • Numerical calculations indicate the potential for complete cancellation of temperature dependence.

    Conclusions:

    • Subwavelength grating waveguides with a periodic composite core offer a viable solution for temperature-independent photonic devices.
    • The presented design significantly enhances the thermal stability of silicon-based photonic components.
    • Further optimization could lead to waveguides with negligible temperature dependence, enabling robust optical communication and sensing applications.