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The propagation of light along an infinite 2D chain of silver nanorods isanalyzed and the dispersion for this waveguide is computed using fieldcomputation for a finite chain of nanorods. In this work, Generalized MultipoleTechnique is used for the analysis. This method calculates the imaginary andreal parts of the propagation constant by exciting the chain in one end andobserving propagation of modes along the chain far enough from the excitation.It is shown that a short chain of finite length is sufficient for thecalculation of the phase constant while the attenuation constant requires alonger chain. Field distribution is depicted for even and odd modes and it isshown that in the simulated frequency range only two modes can be excited andcan propagate along the waveguide.

Modal Analysis for a Waveguide of Nanorods Using the Field Computation for a Chain of Finite Length