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Soft-matter-based topological vertical cavity surface emitting lasers.

Yu Wang1, Shiqi Xia1, Qun Xie1

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Researchers developed a flexible, low-threshold topological vertical cavity surface-emitting laser (VCSEL) using liquid crystal films. This breakthrough offers stable, efficient on-chip light sources for advanced optical and electronic devices.

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Area of Science:

  • Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Topological lasers offer stable, efficient on-chip light sources.
  • Current semiconductor topological lasers require complex fabrication and lack flexibility.
  • Existing methods limit applications in diverse, adaptable electronic devices.

Purpose of the Study:

  • To design and realize a flexible, low-threshold topological VCSEL.
  • To overcome fabrication complexity and performance limitations of current topological lasers.
  • To enable new applications in flexible electronics and photonics.

Main Methods:

  • Utilized a one-dimensional optical superlattice created from stacked polymerized cholesteric liquid crystal and Mylar films.
  • Employed films spin-coated with a Pyrromethene 597 solution.
  • Drew analogy to 2D Semenov insulators and quantum valley Hall effect in synthetic parameter space.

Main Results:

  • Demonstrated a structure-flexible, low-threshold, circularly-polarized topological VCSEL.
  • Achieved excellent single-mode operation at low pump power with spatial profile matching the pump laser.
  • Showcased laser property and beam steering maintenance even after multiple bends due to soft-matter metastructure.

Conclusions:

  • The developed soft-matter-based topological VCSEL offers unprecedented flexibility and performance.
  • Ideal for applications requiring bendable, adaptable light sources like consumer electronics, displays, and wearables.
  • Paves the way for advanced optical storage and communication technologies.