Near-field properties of plasmonic nanostructures with high aspect ratio

TL;DR

This paper presents a computational method for accurately simulating the near-field electromagnetic properties of high aspect ratio plasmonic nanostructures, improving numerical convergence and comparison with existing methods.

Contribution

It introduces a Green's dyad technique with cuboidal meshing tailored for high aspect ratio nanostructures, enhancing simulation accuracy and efficiency.

Findings

Discretizing with aspect ratio-matched cells improves convergence.

The method compares favorably with finite element simulations.

Potential for further optimization discussed.

Abstract

Using the Green's dyad technique based on cuboidal meshing, we compute the electromagnetic field scattered by metal nanorods with high aspect ratio. We investigate the effect of the meshing shape on the numerical simulations. We observe that discretizing the object with cells with aspect ratios similar to the object's aspect ratio improves the computations, without degrading the convergency. We also compare our numerical simulations to finite element method and discuss further possible improvements.