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Athermal waveguides for optical communication wavelengths.

Milan M Milošević1, Neil G Emerson, Frederic Y Gardes

  • 1Advanced Technology Institute, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK. m.milosevic@surrey.ac.uk

Optics Letters
|December 6, 2011
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Summary

We developed temperature-insensitive silicon nitride racetrack resonators, achieving a low resonant wavelength shift of 0.2 pm/K. Polymer cladding further reduced losses and improved performance for optical sensing applications.

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Area of Science:

  • Photonics and optical engineering
  • Materials science for optical devices

Background:

  • Silicon-on-insulator (SOI) racetrack resonators are crucial for integrated photonics.
  • Temperature fluctuations can significantly shift resonant wavelengths, impacting device performance.
  • Developing temperature-insensitive optical devices is essential for stable and reliable photonic systems.

Purpose of the Study:

  • To design, fabricate, and characterize temperature-insensitive SOI racetrack resonators.
  • To investigate the impact of various design parameters on temperature-dependent wavelength shifts.
  • To enhance resonator performance through polymer cladding.

Main Methods:

  • Fabrication of silicon-on-insulator racetrack resonators with varying waveguide dimensions, ring radius, coupling length, and gap.
  • Characterization of resonant wavelength shift with temperature changes at 1550 nm.
  • Overlaying silicon waveguides with polymer cladding to assess performance improvements.

Main Results:

  • Achieved a low resonant wavelength shift of 0.2 pm/K for 335 nm × 220 nm waveguides.
  • Identified key parameters influencing temperature-dependent wavelength shift.
  • Demonstrated reduced propagation losses, improved Q value, and higher extinction ratio after polymer cladding.

Conclusions:

  • Successfully designed and fabricated temperature-insensitive SOI racetrack resonators.
  • Polymer cladding is an effective method for enhancing resonator performance and reducing losses.
  • These resonators show promise for stable optical sensing and communication applications.