Optical properties of Au colloids self-organized into rings via copolymer templates

TL;DR

This paper explores the self-organization of gold nanoparticles into ring structures using copolymer templates and investigates their optical properties, highlighting potential applications in optical sensing and plasmonic devices.

Contribution

It demonstrates a scalable method to create gold nanoparticle rings and characterizes their plasmonic resonances, advancing plasmonic sensor development.

Findings

Experimental evidence of plasmon resonances in individual nanoparticles and collective modes

Large-area organization of gold nanoparticle rings achieved

Potential for multi-resonance optical devices in visible-Infra-Red spectrum

Abstract

The investigation of the Localized Surface Plasmon Resonance for plasmonic nanoparticles has opened new perspectives for optical nanosensors. Today, an issue in plasmonics is the development of large scale and low cost devices. We focus here on the Langmuir-Blodgett technique to self-organize gold nanoparticles (~ 7 nm) into rings (~ 60 nm) via polystyrene-b-polymethylmethacrylate templates. In particular, we investigated the optical properties of organized gold nanoparticle rings over large areas and report experimental evidence for plasmon resonances of both individual nanoparticles and collective modes. This paves the way for designing devices with multiple resonances in the visible-Infra-red spectrum and developing optical sensors.