Analysis of plasmon propagation along a chain of metal nanospheres using the generalized multipole technique

Abstract

We compute the dispersion diagram of an infinite chain of silver nanospheres. The Drude model is used to define the permittivity of nanospheres, and the generalized multipole technique (GMT) is applied to solve the Maxwell’s equation and, thus, to analyze the plasmon excitation. The obtained dispersion diagram using the GMT is compared with the result of the dipolar interacting model as well as the quasistatic model. Results of the finite element method are also presented to verify the accuracy of our results. Finally, a finite chain of metal nanospheres is examined for its scattering and propagation length of the guided modes.