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Topological Refraction in Kagome Split-Ring Photonic Insulators.

Huichang Li1, Chen Luo1, Tailin Zhang1

  • 1School of Physics and Materials Science, Nanchang University, Nanchang 330031, China.

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|May 14, 2022
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Summary

Researchers propose a novel valley-Hall photonic insulator using C3v Kagome split-rings. This design enables topological phase transitions and controllable terahertz wave refraction for advanced photonic devices.

Keywords:
edge statestopological phase transitiontopological refractionvalley-Hall-like topology

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Metamaterials

Background:

  • Topological insulators offer unique edge states for wave manipulation.
  • Kagome lattices are known for their rich electronic and photonic properties.
  • Valleytronics utilizes electron pseudospin for information processing.

Purpose of the Study:

  • To propose a novel valley-Hall-like photonic insulator.
  • To investigate topological phase transitions in a C3v Kagome split-ring system.
  • To explore the manipulation of terahertz wave propagation through edge state refraction.

Main Methods:

  • Theoretical analysis of photonic band structures.
  • Numerical calculations of wave propagation.
  • Investigation of symmetry breaking via ring rotations (global α and individual θ).

Main Results:

  • Demonstrated topological phase transitions by breaking C3v symmetry.
  • Observed controllable refraction of edge states at Zigzag terminations.
  • Showcased positive/negative refraction dependent on the valley (K or K') origin.

Conclusions:

  • The proposed C3v Kagome split-ring structure provides a new platform for photonic topological insulators.
  • Achieved tunable terahertz wave manipulation, including directional collimation and negative refraction.
  • Paves the way for advanced photonic devices with applications in beam splitting and imaging.