Spectroscopically forbidden infra-red emission in Au-vertical graphene hybrid nanostructures

TL;DR

This study explores the unique infra-red emission in Au-vertical graphene hybrid nanostructures, revealing intra-band transitions in Au nanoparticles influenced by the graphene environment, with implications for optoelectronic applications.

Contribution

It demonstrates a novel IR emission mechanism in Au-VG hybrids driven by intra-band transitions, expanding understanding of plasmonic interactions in 3D nanostructures.

Findings

Observation of infra-red emission in Au-VG hybrids.

Enhanced light-matter interaction due to 3D VG structure.

Intra-band transitions in Au NPs explained IR emission.

Abstract

Implementation of Au nanoparticles (NPs) is a subject for frontier plasmonic research due to its fascinating optical properties. Herein, the present study deals with plasmonic assisted emission properties of Au NPs-vertical graphene (VG) hybrid nanostructures. The influence of effective polarizability of Au NPs on the surface enhanced Raman scattering and luminescence properties is investigated. In addition, a remarkable infra-red (IR) emission in the hybrid nanostructures is observed and interpreted on the basis of intra-band transitions in Au NPs. The flake-like nanoporous VG structure is invoked for the generation of additional confined photons to impart additional momentum and a gradient of confined excitation energy towards initiating the intra-band transitions of Au NPs. Integrating Au plasmonic materials in three-dimensional VG nanostructures enhances the light-matter interactions. The present study provides a new adaptable plasmonic assisted pathway for optoelectronic and sensing applications.