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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics

Background:

  • Pseudospin describes wave distribution across internal degrees of freedom like polarization or sublattices.
  • Photonic lattices offer a platform to explore wave phenomena analogous to condensed matter systems.

Purpose of the Study:

  • To experimentally demonstrate and explain wave dynamics in a photonic Lieb lattice.
  • To investigate the unique properties of integer pseudospin states, specifically s=1 conical intersection.

Main Methods:

  • Fabrication and characterization of a photonic Lieb lattice.
  • Experimental observation of wave propagation and diffraction patterns.
  • Analysis of pseudospin-dependent phenomena and optical vortex generation.

Main Results:

  • Demonstration of integer pseudospin s=1 conical intersection in a photonic Lieb lattice.
  • Observation of pseudospin-dependent conical diffraction.
  • Experimental generation of higher-charged optical vortices from integer pseudospin states.

Conclusions:

  • Integer pseudospin states in photonic Lieb lattices exhibit distinct wave dynamics.
  • These findings open new avenues for controlling light and generating structured light fields.