Dielectric-Like Behavior of Graphene in Au Plasmon Resonator.

Junku Liu,Kaili Jiang,Shoushan Fan,Qunqing Li,Mengxin Ren,Mo Chen,Lin Xiao,Lihui Zhang

doi:10.1186/s11671-016-1753-6

Abstract

Graphene has proven to be a promising conductive layer in fabricating optical plasmon resonators on insulator substrate using electron beam lithography and has the potential to construct electrically controlled active plasmon resonators. In this study, we investigate the effect of graphene on plasmon resonance using graphene and Au plasmon resonator system as a model at visible and near-infrared wavelength. Our experiment data show that the presence of graphene does not weaken and annihilate the plasmon resonance peaks, instead it predominantly makes the peaks redshift, which is similar to the behavior of depositing SiO2 film on Au plasmon resonators. This fact indicates that graphene predominantly exhibits dielectric-like behavior at visible and near-infrared wavelength, which can be attributed to the low carrier density in graphene compared with metals.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1753-6) contains supplementary material, which is available to authorized users.

Highlights

Optical plasmon resonators are artificial nanostructures on sub-wavelength scale, with the ability to engineer electromagnetic space and control the propagation of electromagnetic wave [1, 2]
In summary, we fabricated Au plasmon resonator array on quartz using graphene as discharge layer
The residual graphene on sample can be removed by O2 reactive ion Etching (RIE), but we found the presence of graphene does not weaken and annihilate the plasmon resonance peaks, and it predominantly makes plasmon resonance peaks shift to the red end

Summary

Introduction

Optical plasmon resonators are artificial nanostructures on sub-wavelength scale, with the ability to engineer electromagnetic space and control the propagation of electromagnetic wave [1, 2]. Since depositing SiO2 film or graphene on the Au plasmon resonators both exhibit the same effect, this indicates that graphene predominantly shows dielectriclike behavior at visible and NIR frequencies. The Au plasmon resonator array is characterized by optical anisotropy in terms of X-polarized and Ypolarized excitation with multiple resonance peaks at visible and NIR wavelength [23].

Results

Conclusion