Numerical study of surface plasmon enhanced nonlinear absorption and refraction
Abbreviated Journal Title
SMALL METAL PARTICLES; 3RD-ORDER OPTICAL NONLINEARITY; GOLD CLUSTERS; SUSCEPTIBILITY; FILMS; NANOPARTICLES; COMPOSITES; DISULFIDE; COLLOIDS; INDEX; Optics
Maxwell Garnett effective medium theory is used to study the influence of silver nanoparticle induced field enhancement on the nonlinear response of a Kerr-type nonlinear host. We show that the composite nonlinear absorption coefficient, beta(c), can be enhanced relative to the host nonlinear absorption coefficient near the surface plasmon resonance of silver nanoparticles. This enhancement is not due to a resonant enhancement of the host nonlinear absorption, but rather due to a phase-shifted enhancement of the host nonlinear refractive response. The enhancement occurs at the expense of introducing linear absorption, alpha(c), which leads to an overall reduced figure of merit beta(c)/alpha(c) for nonlinear absorption. For thin (< 1 mu m) composites, the use of surface plasmons is found to result in an increased nonlinear absorption response compared to that of the host material. (C) 2008 Optical Society of America.
"Numerical study of surface plasmon enhanced nonlinear absorption and refraction" (2008). Faculty Bibliography 2000s. 559.