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Area of Science:

  • Condensed Matter Physics
  • Topological Photonics
  • Quantum Optics

Background:

  • Spin-momentum locking, a consequence of bulk topological order, governs carrier spin and charge flow.
  • Current research on spin-momentum locking primarily examines in-plane transport properties.
  • Exotic phenomena in condensed matter physics are often linked to topological properties.

Purpose of the Study:

  • To report an out-of-plane radiation feature of spin-momentum locking.
  • To demonstrate a high-performance topological vortex laser utilizing this phenomenon.
  • To explore novel control of spin and charge flow in photonic systems.

Main Methods:

  • Investigation of a non-Hermitian topological photonic system.
  • Utilizing gain saturation effects to lift degeneracy of edge modes.
  • Analysis of near-field spin and orbital angular momentum.

Main Results:

  • Observation of an emerging out-of-plane radiation feature of spin-momentum locking.
  • Successful demonstration of a topological vortex laser.
  • Establishment of a one-to-one correspondence between near-field and far-field angular momentum.
  • Lasing enabled from a single topological edge mode due to gain saturation.

Conclusions:

  • The study reveals a novel out-of-plane radiation characteristic of spin-momentum locking in topological photonics.
  • The developed topological vortex laser exhibits high performance and potential for various applications.
  • The methodology offers a new approach to probe near-field topology via far-field lasing emission.
  • This work opens avenues for advanced applications in superresolution imaging, optical tweezers, and optical communication.