Issue
EPL
Volume 79, Number 3, August 2007
Article Number 34002
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/79/34002
Published online 17 July 2007
EPL, 79 (2007) 34002
DOI: 10.1209/0295-5075/79/34002

Negative refraction in nonlinear wave systems

Zhoujian Cao1, 2, Hong Zhang3 and Gang Hu1

1  Department of Physics, Beijing Normal University - Beijing, 100875, China
2  Institute of Applied Mathematics, Academy of Mathematics and System Science, Chinese Academy of Sciences 55, Zhongguancun Donglu, Beijing, 100080, China
3  Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University - Hangzhou, 310027, China

ganghu@bnu.edu.cn

received 11 April 2007; accepted in final form 19 June 2007; published August 2007
published online 17 July 2007

Abstract
Scientists have been familiar with the phenomenon of wave refraction for several centuries. Recently, a novel type of refraction, i.e., negative refraction, where both incident and refractory lines locate on the same side of the normal line, has been predicted and realized in the context of linear optics in the presence of both right- and left-handed materials. In this work, we reveal, by theoretical prediction and numerical verification, negative refraction in nonlinear oscillatory systems. We demonstrate that unlike what happens in linear optics, negative refraction of nonlinear waves does not depend on the presence of the special left-handed material, but depends on suitable physical condition. Namely, this phenomenon can be observed in wide range of oscillatory media under the Hopf bifurcation condition. The complex Ginzburg-Landau equation and a chemical reaction-diffusion model are used to demonstrate the feasibility of this nonlinear negative refraction behavior in practice.

PACS
47.54.-r - Pattern selection, pattern formation.

© Europhysics Letters Association 2007