Design of metallic nanoparticles gratings for filtering properties in the visible spectrum

TL;DR

This paper models metallic nanoparticle gratings using finite element methods to design efficient, polarization-dependent optical filters with high transparency in the visible spectrum, validated by experiments and theoretical analysis.

Contribution

It introduces a combined numerical and analytical approach for designing metallic nanoparticle gratings with tailored filtering properties in the visible range.

Findings

Finite Element Method accurately models nanoparticle gratings.

Designed filters exhibit polarization dependence and high transparency.

Comparison with Maxwell-Garnett theory validates the modeling approach.

Abstract

Plasmonic resonances in metallic nanoparticles are exploited to create efficient optical filtering functions. A Finite Element Method is used to model metallic nanoparticles gratings. The accuracy of this method is shown by comparing numerical results with measurements on a two-dimensional grating of gold nanocylinders with elliptic cross section. Then a parametric analysis is performed in order to design efficient filters with polarization dependent properties together with high transparency over the visible range. The behavior of nanoparticle gratings is also modelled using the Maxwell-Garnett homogenization theory and analyzed by comparison with the diffraction by a single nanoparticle. The proposed structures are intended to be included in optical systems which could find innovative applications.