Asymmetric conical diffraction in dislocated edge-centered square lattices
arXiv:1902.01051 · doi:10.1364/OE.27.006300
Abstract
We investigate linear and nonlinear evolution dynamics of light beams propagating along a dislocated edge-centered square lattice. The band structure and Brillouin zones of this novel lattice are analyzed analytically and numerically. Asymmetric Dirac cones as well as the corresponding Bloch modes of the lattice are obtained. By adopting the tight-binding approximation, we give an explanation of the asymmetry of Dirac cones. By utilizing the appropriate Bloch modes, linear and nonlinear asymmetric conical diffraction is demonstrated. We find that both the focusing and defocusing nonlinearities can enhance the asymmetry of the conical diffraction.
10 pages, 7 figures
References in corpus (6)
- Topological Photonics
- Topological Acoustics
- Observation of a localized flat-band state in a photonic Lieb lattice
- Observation of bound states in Lieb photonic lattices
- Unveiling pseudospin and angular momentum in photonic graphene
- Quantum transport in Dirac materials: signatures of tilted and anisotropic Dirac and Weyl cones