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Related Experiment Video

Updated: Aug 23, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Topological polarization singular lasing with highly efficient radiation channel.

Yun-Gang Sang1,2, Jing-Yu Lu1,2, Yun-Hao Ouyang1,2

  • 1State Key Lab for Mesoscopic Physics and School of Physics, Peking University, Beijing, China.

Nature Communications
|October 30, 2022
PubMed
Summary
This summary is machine-generated.

We developed a novel topological polarization singular laser that overcomes the low radiation efficiency of bound states in the continuum (BICs). This new laser design achieves high quality factors and efficient light emission for advanced photonic applications.

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Bound states in the continuum (BICs) in photonic crystals exhibit high quality factors but suffer from limited far-field radiation efficiency due to topological polarization singularities.
  • Existing BIC applications for light emission are hindered by the inability of topological singularities to transport energy to the far field.

Purpose of the Study:

  • To demonstrate a novel topological polarization singular laser with enhanced radiation efficiency.
  • To engineer eigenmodes for improved mode selection, exotic field manipulation, and efficient lasing.

Main Methods:

  • Integration of a topological polarization singular channel in the second Brillouin zone.
  • Incorporation of a paired linearly polarized radiation channel in the first Brillouin zone.
  • Experimental demonstration of room-temperature operation.

Main Results:

  • The singular channel facilitates single-mode lasing with a higher quality factor compared to other modes.
  • The radiation channel ensures high lasing mode efficiency.
  • The demonstrated laser operates at room temperature with an external quantum efficiency exceeding 24%.

Conclusions:

  • The developed topological polarization singular laser offers a new paradigm for eigenmode engineering.
  • This approach enables efficient light emission from BICs by overcoming previous limitations.
  • The findings pave the way for advanced photonic devices with tailored optical properties.