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Compactification tuning for nonlinear localized modes in sawtooth lattices

AuthorsJohansson, Magnus; Naether, Uta; Vicencio, Rodrigo A.
Issue Date2015
PublisherAmerican Physical Society
CitationPhysical Review D 92(3): 032912 (2015)
AbstractWe discuss the properties of nonlinear localized modes in sawtooth lattices, in the framework of a discrete nonlinear Schrödinger model with general on-site nonlinearity. Analytic conditions for existence of exact compact three-site solutions are obtained, and explicitly illustrated for the cases of power-law (cubic) and saturable nonlinearities. These nonlinear compact modes appear as continuations of linear compact modes belonging to a flat dispersion band. While for the linear system a compact mode exists only for one specific ratio of the two different coupling constants, nonlinearity may lead to compactification of otherwise noncompact localized modes for a range of coupling ratios, at some specific power. For saturable lattices, the compactification power can be tuned by also varying the nonlinear parameter. Introducing different on-site energies and anisotropic couplings yields further possibilities for compactness tuning. The properties of strongly localized modes are investigated numerically for cubic and saturable nonlinearities, and in particular their stability over large parameter regimes is shown. Since the linear flat band is isolated, its compact modes may be continued into compact nonlinear modes both for focusing and defocusing nonlinearities. Results are discussed in relation to recent realizations of sawtooth photonic lattices.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevE.92.032912
Identifiersdoi: 10.1103/PhysRevE.92.032912
issn: 2470-0045
e-issn: 2470-0053
Appears in Collections:(ICMA) Artículos
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