Subwavelength plasmonic kinks in arrays of metallic nanoparticles
  We analyze nonlinear effects in optically driven arrays of nonlinear metallic nanoparticles. We demonstrate that such plasmonic systems are characterized by a bistable response, and they can support the propagation of dissipative switching waves (or plasmonic kinks) connecting the states with different polarization. We study numerically the properties of such plasmonic kinks which are characterized by a subwavelength extent and a tunable velocity. 
Roman E. Noskov, Pavel A. Belov, and Yuri S. Kivshar
physics.optics