Bragg guiding of domain-like nonlinear modes and kink arrays in lower-index core structures

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Ye, Fangwei
Kartashov, Yaroslav V.
Vysloukh, Victor A.
Torner, Lluis
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We introduce a novel class of stable nonlinear modes trapped in a lower-index film core sandwiched between two optical lattices, or in the cylindrical core of a radial lattice, imprinted in defocusing media. Such family of nonlinear modes transforms into defect lattice solitons when the core width is sufficiently small or into an array of kinks when the width is large enough. We find that higher-order modes with multiple zeros inside the guiding core can be stable in one-dimensional settings.
Comment: 12 pages, 3 figures, to appear in Optics Letters
Keywords
Physics - Optics, Nonlinear Sciences - Pattern Formation and Solitons
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