Loss-compensated nonlinear modes and symmetry breaking in amplifying metal-dielectric-metal plasmonic couplers

Andrea Marini, Samudra Roy, Ajit Kumar, Fabio Biancalana

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Abstract

We theoretically investigate the propagation of surface plasmon polaritons in an amplifying plasmonic coupler (metal-amplifying dielectric-metal). We study the loss-compensated nonlinear stationary modes of the system by deriving coupled-mode equations for the optical amplitudes, predicting the existence of a mode with broken symmetry for gain values higher than a characteristic threshold. We analyze the stability of symmetric, antisymmetric, and nonsymmetric modes by solving the linearized system for small perturbations and by numerically integrating coupled-mode equations in propagation. We find that, while the antisymmetric mode stays always stable or marginally stable, the stability of symmetric and nonsymmetric modes is more involved.

Original languageEnglish
Article number043815
Number of pages7
JournalPhysical Review A
Volume91
Issue number4
DOIs
Publication statusPublished - 9 Apr 2015

Keywords

  • SLOT WAVE-GUIDES
  • GAIN
  • POLARITONS
  • SUSCEPTIBILITY
  • AMPLIFICATION
  • SOLITONS

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