Discrete Dipole Approximation Calculation of the Extinction Spectra of Gold-Silver Alloy Nanoparticles

摘要

By using the discrete-dipole approximation,we computed the extinction spectrum of a gold-silver alloy nanoparticle.We have examined how the surface plasmon resonance changes with respect to the variation in the composition of the alloy particle.As the fraction of silver increases for a 10nm particle,the peak position of the extinction spectrum blue-shifts linearly.The intensity of the peak however increases exponentially with increasing the silver fraction.These results are in accord with the previous experimental results.