ultrafast nonlinear optical responses of dielectric composite materials containing metal nanoparticles with different sizes and shapes

We present a theoretical approach for calculating the ultrafast nonlinear optical responses of dielectric composite materials containing metal nanoparticles with different sizes and shapes, taking silica glasses doped with silver nanospheres and nanorods. the approach is based on the model for nonlinear responses of metal nanoparticles combined with time-domain discrete dipole approximation for total field and the effective medium approximation. we numerically study the dependencies of the nonlinear transmittance of those composite films on several parameters such as sizes and aspect ratios of metal nanoparticles, pulse fluences and wavelengths of pump.