Effect of Plasmonic Coupling in Different Assembly of Gold Nanorods Studied by FDTD

TL;DR

This study uses FDTD simulations to analyze how the orientation and assembly of gold nanorods affect plasmon coupling, resonance modes, and field enhancements, with implications for designing plasmonic devices.

Contribution

It provides a detailed simulation-based analysis of how nanorod assembly geometry influences plasmonic properties, including Fano resonances and mode tuning.

Findings

Plasmon coupling significantly affects longitudinal resonances.

Different geometries exhibit unique spectral responses, including Fano-like resonances.

Resonance wavelengths and field enhancements can be tuned by geometry modifications.

Abstract

The influence of the orientation of gold nanorods in different assemblies has been investigated using the Finite Difference Time Domain (FDTD) simulation method. To understand the relative orientation, we vary the size and angle in dimer geometries. Significant effects of plasmon coupling emerged in longitudinal resonances having end-to-end configurations of gold nanorods. The effect of orientational plasmon coupling in dimers gives rise to both bonding and anti-bonding plasmon modes. Effects of various geometries like primary monomer, dimer, trimer, and tetramer structures have been explored and compared with their higher nanorod ensembles. The asymmetric spectral response in a 4 * 4 gold nanorods array indicates a Fano-like resonance. The variation of gap distance in ordered arrays allowed modulation of the Fano resonance mode. The plasmon modes' resonance wavelength and field enhancement have been tuned by varying the gap distance, angular orientation, size irregularity between the nanorods, and nanorod numbers in an array. The integrated nanostructures studied here are not only significant for fundamental research but also applications in plasmon-based devices.