Step-like structure and assisted tunneling in two coupled modulated waveguides
Institute of Theoretical Physics and Department of Physics, Shanxi
University, 030006, Taiyuan, P.R. China
Revised: 13 July 2010
Published online: 1 October 2010
The propagation of an initially-localized optical beam along two coupled modulated waveguides is investigated. A universal step-like structure emerges in the propagation process once v/ ~ 1 and T = 2 π/, both for the linear and nonlinear optical waveguides. The reason is that the coupling between the two waveguides can be completely suppressed at z = mT or (2 m+1)T/2. When the nonlinearity is strong, assisted tunneling can be found for the initially-localized optical beam by slightly increasing the strength of the modulation.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010