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On-chip topological edge state cavities.

Wenhao Wang1,2, Zhonglei Shen1,2, Yi Ji Tan1,2

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.

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Researchers developed a novel topological edge state cavity for enhanced light confinement in photonic devices. This robust on-chip platform significantly boosts the quality factor and free spectral range for advanced optical applications.

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Area of Science:

  • Photonics
  • Quantum Optics
  • Condensed Matter Physics

Background:

  • Confining light in on-chip photonic cavities is crucial for optical and quantum sciences.
  • Topological valley photonics offers robust light manipulation through topological protection.

Purpose of the Study:

  • To present a topological edge state cavity for enhanced light confinement and robust on-chip light guiding.
  • To improve the quality factor and free spectral range of photonic cavities.

Main Methods:

  • Designing and fabricating a topological edge state cavity.
  • Utilizing topological valley edge states for light confinement and circulation.
  • Tailoring radiation leakage and group index to optimize cavity performance.

Main Results:

  • Achieved confinement of light within a topological bandgap using topological edge states.
  • Demonstrated a three-orders-of-magnitude enhancement in the intrinsic quality factor.
  • Increased the free spectral range from 5.1 GHz to 7.1 GHz.

Conclusions:

  • The developed topological edge state cavity offers a novel and robust platform for on-chip light confinement.
  • This platform enables significant improvements in quality factor and free spectral range.
  • Potential applications include high-capacity communications, nonlinear optics, atomic clocks, and quantum photonics.