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Updated: May 21, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Mode conversion in tapered submicron silicon ridge optical waveguides.

Daoxin Dai1, Yongbo Tang, John E Bowers

  • 1Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation, Zhejiang Provincial Key Laboratory for Sensing Technologies, Zhejiang University, Zijingang Campus, Hangzhou 310058, China. dxdai@zju.edu.cn

Optics Express
|June 21, 2012
PubMed
Summary

Mode conversion in silicon optical waveguides is explored. Researchers found that carefully designed tapers can achieve nearly 100% efficiency for mode conversion, enabling applications like polarizers and polarization splitters.

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Area of Science:

  • Photonics
  • Materials Science
  • Electrical Engineering

Background:

  • Submicron silicon ridge optical waveguides are crucial for integrated photonics.
  • Mode conversion in these waveguides can be influenced by structural asymmetry.

Purpose of the Study:

  • To theoretically and experimentally investigate mode conversion in tapered submicron silicon ridge optical waveguides.
  • To explore the potential applications of efficient mode conversion.

Main Methods:

  • Analysis of two taper types: regular lateral and bi-level.
  • Theoretical modeling and experimental verification of mode conversion mechanisms.
  • Investigation of mode hybridization due to cross-sectional asymmetry.

Main Results:

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  • Observed efficient mode conversion between TM fundamental and higher-order TE modes.
  • Achieved nearly 100% conversion efficiency with optimized taper design.
  • Demonstrated control over mode conversion by adjusting taper parameters.

Conclusions:

  • Tapered silicon waveguides facilitate efficient mode conversion.
  • This phenomenon enables applications such as polarizers and polarization splitters.
  • Mode conversion can be suppressed for applications requiring low-loss TM fundamental mode propagation.