Enhanced Light-Matter Interactions in Graphene-Covered Gold Nanovoid Arrays

被引：216

作者：

Zhu, Xiaolong ^{[1
,2
]}

Shi, Lei ^{[3
,4
]}

Schmidt, Michael S. ^{[5
]}

Boisen, Anja ^{[5
]}

Hansen, Ole ^{[5
,6
]}

Zi, Jian ^{[3
,4
]}

Xiao, Sanshui ^{[1
,2
]}

Mortensen, N. Asger ^{[1
,2
]}

机构：

[1] Tech Univ Denmark, Dept Photon Engn, DK-2800 Lyngby, Denmark

[2] Tech Univ Denmark, CNG, DK-2800 Lyngby, Denmark

[3] Fudan Univ, Dept Phys, Minist Educ, Key Lab Micro & Nanophoton Struct, Shanghai 200433, Peoples R China

[4] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[5] Tech Univ Denmark, Dept Micro & Nanotechnol, DK-2800 Lyngby, Denmark

[6] Tech Univ Denmark, CINF, DK-2800 Lyngby, Denmark

来源：

NANO LETTERS | 2013年 / 13卷 / 10期

基金：

新加坡国家研究基金会;

关键词：

Plasmonics; graphene; light matter interaction; surface-enhanced Raman scattering; RAMAN-SPECTROSCOPY; SURFACE; SCATTERING; PLASMONS; ABSORPTION;

D O I：

10.1021/nl402120t

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The combination of graphene with noble-metal nanostructures is currently being explored for strong light graphene interactions enhanced by I. plasmons. We introduce a novel hybrid graphene metal system for studying light matter interactions with gold-void nanostructures exhibiting resonances in the visible range. Enhanced coupling of graphene to the plasmon modes of the nanovoid arrays results in significant frequency shifts of the underlying plasmon resonances, enabling 30% Ienhanced absolute light absorption by adding a monolayer graphene and up to 700-fold enhancement of the Raman response of the graphene. These new pempectives enable us to verify the presence of graphene on gold-void arrays, and the enhancement even allows us to accurately quantify the number of layers. Experimental observations are further supported by numerical simulations and perturbation-theory analysis. The graphene gold-void platform is beneficial for sensing of Molecules and placing Rhodamine 6G (R6G) dye molecules on top of the graphene; we observe a strong enhancement of the R6G Raman fingerprints. These results pave the way toward advanced substrates for surface-enhanced Raman scattering (SERS) with potential for unambiguous single-molecule detection on the atomically well-defined layer of graphene.

引用

页码：4690 / 4696

页数：7

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