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Symmetric and antisymmetric nonlinear modes supported by dual local gain in lossy lattices

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Abstract

We introduce a discrete lossy system, into which a double “hot spot” (HS) is inserted, i.e., two mutually symmetric sites carrying linear gain and cubic nonlinearity. The system can be implemented as an array of optical or plasmonic waveguides, with a pair of amplified nonlinear cores embedded into it. We focus on the case of self-defocusing nonlinearity and cubic losses acting at the HSs. Symmetric localized modes pinned to the double HS are constructed in an implicit analytical form, which is done separately for the cases of odd and even numbers of intermediate sites between the HSs. In the former case, some stationary solutions feature a W-like shape, with a low peak at the central site, added to tall peaks at the positions of the embedded HSs. The special case of two adjacent HSs is considered too. Stability of the solution families against small perturbations is investigated in a numerical form, which reveals stable and unstable subfamilies. The instability generated by an isolated positive eigenvalue leads to a spontaneous transformation into a co-existing stable antisymmetric mode, while a pair of complex-conjugate eigenvalues gives rise to persistent breathers. This article is a contribution to the volume dedicated to Professor Helmut Brand on the occasion of his 60th birhday.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Hong Kong, Pokfulam Road, Hong Kong, China

    K.W. Chow & A.Y.S. Tang

  2. Department of Mathematics and Physics, Azusa Pacific University, Box 7000, Azusa, CA, 91702-7000, USA

    Edwin Ding

  3. Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel

    B.A. Malomed

Authors
  1. K.W. Chow
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  2. Edwin Ding
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  3. B.A. Malomed
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  4. A.Y.S. Tang
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Correspondence to B.A. Malomed.

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Chow, K., Ding, E., Malomed, B. et al. Symmetric and antisymmetric nonlinear modes supported by dual local gain in lossy lattices. Eur. Phys. J. Spec. Top. 223, 63–77 (2014). https://doi.org/10.1140/epjst/e2014-02084-3

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  • DOI: https://doi.org/10.1140/epjst/e2014-02084-3

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