High-Directional Wave Propagation in Periodic Gain/Loss Modulated Materials
Computational Physics
2015-06-04 v1 Optics
Abstract
Amplification/attenuation of light waves in artificial materials with a gain/loss modulation on the wavelength scale can be sensitive to the propagation direction. We give a numerical proof of the high anisotropy of the gain/loss in two dimensional periodic structures with square and rhombic lattice symmetry by solving the full set of Maxwell's equations using the finite difference time domain method. Anisotropy of amplification/attenuation leads to the narrowing of the angular spectrum of propagating radiation with wavevectors close to the edges of the first Brillouin Zone. The effect provides a novel and useful method to filter out high spatial harmonics from noisy beams.
Keywords
Cite
@article{arxiv.1202.4585,
title = {High-Directional Wave Propagation in Periodic Gain/Loss Modulated Materials},
author = {N. Kumar and M. Botey and R. Herrero and Yu. Loiko and K. Staliunas},
journal= {arXiv preprint arXiv:1202.4585},
year = {2015}
}