A system of coupled nonlinear Schrodinger (NLSEs) of two fundamental and dark solitons are numerically investigated by Split-Step Fourier Method (SSFM) simulation. The stability of the evolved 'bright' envelopes as the superimposed of two dark solitons has been compared with the interaction of bright fundamental solitons in the perturbed or lossy fiber. Dynamic nature of the solitons in the the presence of nonlinear-dispersive phenomena, their relative amplitude i r relative phase i and their separation distance 0 q (0 r) are evaluated in the simulation.
Optical characterization of both gold and silver bi-pyramid nano-shells are investigated using the finite difference time domain (FDTD) method. This method is a convenient way for describing both quantitatively and qualitatively the optical response of nano-oshells/nanoparticles of arbitrary geometry and shape that surrounding the active medium. The surface plasmon peaks of gold and silver bi-pyramid nano-shell can be tuned from visible to the near infrared region by controlling the size (aspect ratio), surface sharpness and polarization of light. Surface plasmons provide a powerful means of confining light to nano-shells, which in turn can enhance local electromagnetic fields and significantly amplify the signal finally used for surface enhanced Raman scattering (SERS).
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