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This study introduces a novel topological insulator laser system for robust, single-mode lasing. The system demonstrates enhanced efficiency and unidirectional light emission without magnetic fields, paving the way for advanced topological devices.

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Topological insulators exhibit robust transport properties due to topological invariants, making them resistant to defects and disorder.
  • Exploiting topological phenomena in photonics has been a recent focus for developing robust optical systems.
  • Existing topological systems often require magnetic fields or lack practical device applications.

Purpose of the Study:

  • To demonstrate a nonmagnetic topological insulator laser system with topologically protected transport.
  • To investigate the lasing properties, including mode stability and efficiency, of such a system.
  • To explore the use of S-chiral microresonators for unidirectional lasing in active topological platforms.

Main Methods:

  • Fabrication of a nonmagnetic topological insulator laser system.
  • Utilizing S-chiral microresonators to engineer unidirectional light propagation.
  • Characterization of lasing properties, including mode spectrum, robustness to defects, and slope efficiency.

Main Results:

  • The topological insulator laser system exhibited topologically protected transport within the cavity.
  • Single-mode lasing and significant robustness against defects were observed.
  • The system achieved considerably higher slope efficiencies compared to topologically trivial counterparts.
  • Unidirectional lasing was achieved without the need for external magnetic fields.

Conclusions:

  • The developed nonmagnetic topological insulator laser system offers robust single-mode lasing and enhanced efficiency.
  • The use of S-chiral microresonators enables controlled unidirectional lasing, highlighting the potential of active topological platforms.
  • This research opens avenues for the development of novel active topological devices with unique functionalities.