Compactification tuning for nonlinear localized modes in sawtooth lattices

Magnus Johansson, Uta Naether, and Rodrigo A. Vicencio
Phys. Rev. E 92, 032912 – Published 17 September 2015

Abstract

We 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.

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  • Received 6 July 2015

DOI:https://doi.org/10.1103/PhysRevE.92.032912

©2015 American Physical Society

Authors & Affiliations

Magnus Johansson*

  • Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden

Uta Naether

  • Instituto de Ciencia de Materiales de Aragón y Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, Zaragoza E-50009, Spain

Rodrigo A. Vicencio

  • Departamento de Física and MSI-Nucleus on Advanced Optics, Center for Optics and Photonics (CEFOP), Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile

  • *mjn@ifm.liu.se; https://people.ifm.liu.se/majoh
  • naether@unizar.es
  • rodrigov@uchile.cl

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Vol. 92, Iss. 3 — September 2015

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