Nonlinear switching of low-index defect modes in photonic lattices

Details Nonlinear switching of low-index defect modes in photonic lattices Nonlinear switching of low-index defect modes in photonic lattices

2008-06-17

arxiv.org/abs/0806.2742v1

Physical Review A 78, 013847 (2008)

Physics

Optics

13 pages, 4 figures, to appear in Physical Review A

Scientific paper

10.1103/PhysRevA.78.013847

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.

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