Modulation instability in waveguides doped with anisotropic nanoparticles

Abstract

We exploit the anisotropic plasmonic behavior of gold nanorods (AuNRs) to obtain a waveguide with a nonlinear coefficient dependent on both the frequency and polarization of incident light. The optical properties of the waveguide are described by an extension of the Maxwell Garnett model to nonlinear optics and anisotropic nanoparticles. Then, we perform a study of modulation instability (MI) in this system by resorting to the recently introduced photon-conserving nonlinear Schrödinger equation (pcNLSE), as the pcNLSE allows us to model propagation in nonlinear waveguides of arbitrary sign and frequency dependence of the nonlinear coefficient. Results show that the anisotropy of the nanorods leads to two well-differentiated MI regimes, a feature that may find applications in all-optical devices.

Formation of Au, Pt, and bimetallic Au–Pt nanostructures from thermal dewetting of single-layer or bilayer thin films

“…The use of dewetting, including pulsed-laser-induced dewetting and thermal dewetting, to form metal nanoparticles and other nanostructures has been widely studied for many metals [6][7][8][9][10]. These metal nanostructures have found a broad range of applications, including catalysts for nanostructure growth [11] or for fuel cells [12], magnetic data storage [10], sensors [13], plasmonic waveguides [14], and etching masks [15].…”

A generic model for the study of supercontinuum generation in graphene-covered nanowires

“…In particular, we extended the pcNLSE to account for TPA in [28]. We must emphasize that the pcNLSE and its modifications [29] have been successfully used to model the propagation of optical pulses in a variety of cases [30][31][32][33][34].…”