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Area of Science:

  • Condensed matter physics
  • Classical wave systems
  • Topological photonics

Background:

  • Topological characteristics of energy bands, such as Dirac and Weyl nodes, are of significant interest.
  • Type-II Dirac points, a nodal degeneracy with tilted conical dispersion, have been observed in electronic materials.
  • Experimental realization of type-II Dirac points in photonic systems is considered challenging.

Purpose of the Study:

  • To experimentally realize the type-II Dirac point in a photonic system.
  • To investigate the potential of planar metasurfaces for creating topological features.
  • To explore applications in two-dimensional topological photonics.

Main Methods:

  • Utilized a planar metasurface architecture.
  • Leveraged underlying mirror symmetry to protect the band degeneracy point.
  • Investigated gapless edge modes at domain boundaries of symmetry-broken metasurfaces.

Main Results:

  • Successfully experimentally realized the type-II Dirac point in a photonic metasurface.
  • Observed and measured gapless edge modes at the boundary between different metasurface domains.
  • Demonstrated that metasurfaces are practical platforms for electromagnetic type-II Dirac points.

Conclusions:

  • Metasurfaces provide a simple and practical platform for realizing electromagnetic type-II Dirac points.
  • The planar structure of metasurfaces offers advantages for applications in two-dimensional topological photonics.
  • This work bridges the gap between theoretical concepts and experimental realization of topological features in photonic systems.