Spectral tunneling of lattice nonlocal solitons

Details Spectral tunneling of lattice nonlocal solitons Spectral tunneling of lattice nonlocal solitons

2010-06-17

arxiv.org/abs/1006.3401v1

Phys.Rev.A82:013806,2010

Physics

Optics

12 pages, 3 figures, to appear in Physical Review A

Scientific paper

10.1103/PhysRevA.82.013806

We address spectral tunneling of walking spatial solitons in photorefractive media with nonlocal diffusion of the nonlinear response and an imprinted shallow optical lattice. In contrast to materials with local nonlinearities, where solitons travelling across the lattice close to the Bragg angle suffer large radiative losses, in photorefractive media with diffusion nonlinearity resulting in self-bending solitons survive when their propagation angle approaches and even exceeds the Bragg angle. In the spatial frequency domain this effect can be considered as tunneling through the band of spatial frequencies centered around the Bragg frequency where the spatial group velocity dispersion is positive.

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