Oscillatory optical response of amorphous plasmonic nanoparticle arrays

TL;DR

This study investigates how amorphous gold nanodisk arrays exhibit oscillatory optical responses due to the interplay of individual particle properties and inter-particle coupling, influenced by array geometry.

Contribution

It reveals the oscillatory behavior of plasmonic properties in amorphous nanoparticle arrays and links these effects to particle spacing and interactions.

Findings

Oscillatory shifts in plasmon peak position with particle spacing

Dependence of extinction efficiency on inter-particle distance

Distinct optical behavior in amorphous arrays compared to ordered structures

Abstract

The optical response of metallic nanoparticle arrays is dominated by localized surface plasmon excitations and is the sum of individual particle contributions modified by inter-particle coupling depending on specific array geometry. Here we scrutinize how experimentally measured properties of large scale (30 mm$^{2}$) amorphous Au nanodisk arrays stem from single particle properties and their interaction. They give rise to a distinct oscillatory behavior of the plasmon peak position, full-width at half-maximum, and extinction efficiency which depends on the minimum particle center-to-center (CC) distance.