Metal-Dielectric-Graphene Sandwich for Surface Enhanced Raman Spectroscopy

TL;DR

This paper demonstrates that inserting a thin dielectric layer in a metal-dielectric-graphene sandwich structure significantly enhances Raman signals of Rhodamine B through plasmonic resonance while preserving fluorescence quenching.

Contribution

It introduces a novel metal-dielectric-graphene sandwich design that boosts surface-enhanced Raman spectroscopy signals by reducing plasmon damping.

Findings

Raman intensity of RhB is sharply increased by plasmonic resonance.

Optimized dielectric layer thickness maintains fluorescence quenching.

Enhanced Raman signals achieved without compromising fluorescence suppression.

Abstract

Raman intensity of Rhodamine B (RhB) is enhanced by inserting a thin high \k{appa} dielectric layer which reduces the surface plasmon damping at the gold-graphene interface. The results indicate that the Raman intensity increases sharply by plasmonic resonance enhancement while maintaining efficient fluorescence quenching with optimized dielectric layer thickness.