Neighboring Interactions in a Periodic Plasmonic Material for Solar-Thermal Energy Conversion

TL;DR

This study uses FDTD simulations to explore how neighboring particles in a periodic plasmonic material affect optical absorption, revealing resonances that can enhance solar-thermal energy conversion efficiency.

Contribution

It provides a detailed analysis of particle interactions and resonances in a plasmonic meta-material, highlighting design parameters for improved solar-thermal applications.

Findings

Identification of resonances that broaden absorption response.

Coupled resonance between metal-dielectric and cavity modes.

Prediction of surface plasmon polariton resonance at specific particle widths.

Abstract

A periodic plasmonic meta-material was studied using finite-difference time domain (FDTD) method to investigate the influence of neighboring particles on the near unity optical absorptivity. The meta-material was constructed as a silver nanoparticle (20-90nm) situated above an alumina (Al$_2$O$_3$) dielectric environment. A full parametric sweep of the particle width and the dielectric thickness was conducted. Computational results identified several resonances between the metal-dielectric and metal-air that have potential to broadening the response through stacked geometry. A significant coupled resonance between the metal-dielectric resonance and a cavity resonance between particles was capture as a function of dielectric thickness. This coupled resonance was not evident below dielectric thicknesses of 40nm and above cavity widths of 20nm. Additionally, a noticeable propagating surface plasmon polariton resonance was predicted when the particle width was half the unit cell length.