Asymmetric conical diffraction in dislocated edge-centered square lattices
Optics
2019-05-31 v3
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.
Cite
@article{arxiv.1902.01051,
title = {Asymmetric conical diffraction in dislocated edge-centered square lattices},
author = {Hua Zhong and Rong Wang and Milivoj R. Belic and Yanpeng Zhang and Yiqi Zhang},
journal= {arXiv preprint arXiv:1902.01051},
year = {2019}
}
Comments
10 pages, 7 figures