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Highly sensitive silicon microring sensor with sharp asymmetrical resonance.

Huaxiang Yi1, D S Citrin, Zhiping Zhou

  • 1State Key Laboratory on Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China.

Optics Express
|February 23, 2010
PubMed
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We analyzed silicon microring resonators, revealing that waveguide reflections create asymmetric Fano resonances. This design enhances sensing performance, achieving a detection limit of 10(-8) refractive index units (RIU).

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Silicon microring resonators are key components in integrated optics.
  • End-facet reflections in coupled waveguides can significantly alter resonance spectra.
  • Understanding these effects is crucial for optimizing device performance.

Purpose of the Study:

  • To analyze the resonance spectrum of silicon microring resonators considering end-facet reflections.
  • To investigate the resulting asymmetric Fano-like non-Lorentzian resonance.
  • To demonstrate enhanced sensing performance and high sensitivity.

Main Methods:

  • Theoretical analysis using scattering theory.
  • Experimental verification using a 10-micrometer racetrack silicon microring resonator.

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  • Characterization of the resonance spectrum and sensing performance.

    • Main Results:

    • A dense set of Fabry-Perot resonances was observed due to end-facet reflections.
    • Asymmetric Fano-like non-Lorentzian resonances were successfully obtained.
    • Enhanced sensing performance with a steeper resonance slope was theoretically predicted and experimentally demonstrated.

    Conclusions:

    • End-facet reflections in silicon microring resonators lead to unique Fano resonances.
    • This phenomenon enables significantly improved sensing capabilities.
    • A high sensitivity of approximately 10(-8) RIU was achieved, showing potential for advanced sensing applications.