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Dirac-vortex topological cavities.

Xiaomei Gao1,2, Lechen Yang1,3, Hao Lin1,3

  • 1Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, Beijing, China.

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|October 20, 2020
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Summary
This summary is machine-generated.

We introduce a novel 2D topological cavity design for semiconductor lasers, enabling scalable, single-mode operation with an unprecedented large free spectral range for advanced photonic applications.

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Cavity design is critical for single-mode semiconductor lasers like distributed feedback (DFB) and vertical-cavity surface-emitting lasers (VCSELs).
  • Existing designs often rely on topological defect modes within 1D lattices.

Purpose of the Study:

  • To extend the concept of topological cavity design into two dimensions.
  • To develop novel micro-resonators for scalable, single-mode laser applications.

Main Methods:

  • Theoretical prediction and experimental demonstration of 2D topological cavities.
  • Utilizing a honeycomb photonic crystal with a vortex Dirac gap via generalized Kekulé modulations.
  • Fabrication on a silicon-on-insulator platform.

Main Results:

  • Demonstrated Dirac-vortex cavities with scalable mode areas and arbitrary mode degeneracies.
  • Achieved vector-beam vertical emission and compatibility with high-index substrates.
  • Observed an unprecedentedly large free spectral range, decoupling resonator size and resonance spacing.

Conclusions:

  • The developed topological micro-resonator offers scalable, single-mode operation.
  • This design overcomes limitations of traditional resonator scaling and spectral properties.
  • The technology is highly suitable for large-area, single-mode photonic-crystal surface-emitting lasers.