Extreme nonlinear optical enhancement in chalcogenide glass fibers with   deep-subwavelength metallic nanowires
  A nanostructured chalcogenide-metal optical fiber is proposed. This hybrid nanofiber is embedded with a periodic array of triangular-shaped deep-subwavelength metallic nanowires set up in a bowtie configuration. Our simulations show that the proposed nanostructured fiber supports a guided collective plasmonic mode enabling both subwavelength field confinement and extreme nonlinear light- matter interactions, much larger than a bare chalcogenide nanowire of comparable diameter. This is all achieved with less than 3% by volume of metal content. 
Bora Ung and Maksim Skorobogatiy
physics.optics cond-mat.mes-hall physics.comp-ph