Nonlinear switching of low-index defect modes in photonic lattices

Date
Authors
Ye, Fangwei
Kartashov, Yaroslav V.
Vysloukh, Victor A.
Torner, Lluis
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
We address nonlinear signal switching between two low-index defect channels induced in periodic optical lattices. In contrast to conventional directional couplers, where the guiding mechanism is total internal reflection or refraction, in such Bragg-type coupler, the guidance is of a photonic-bandgap origin. The coupling length in the low-index coupler is controlled by the lattice parameters and by the channel spacing. In the nonlinear regime the Bragg-type coupler behaves as an all-optical switch, exhibiting a remarkable difference of switching power for focusing versus defocusing nonlinearity.
Comment: 13 pages, 4 figures, to appear in Physical Review A
Keywords
Physics - Optics, Nonlinear Sciences - Pattern Formation and Solitons
Citation
Collections