Lage Area Graphene Plasmons Based On Anodic Alumina Template

As a novel surface plasmon material,graphene has important applications in the mid-far infrared and terahertz bands.Compared with the traditional metal surface plasmons,graphene surface plasmons have higher electromagnetic field localization and lower propagation loss in the infrared band.More importantly,the resonant frequency can be dynamically adjusted by external gate voltage,which breaks through the limitation that metal surface plasmons is difficult to dynamically adjust,and provides an effective solution for the development of wide-band infrared absorption spectroscopy technology,which greatly promotes the development of the field.To address the time-consuming and expensive problem of preparing nanostructures,in this paper,the method of anodic alumina template transfer etching is proposed to prepare large area of nanostructures and successfully excite surface plasmons of graphene.From the design model,software simulation and experimental verification of three aspects to carry out research,and the theoretical model of graphene surface plasmons was established.The graphene surface plasmons based on anodic alumina template was prepared,which laid a foundation for the study of graphene surface plasmons.The main results are as follows:(1)The infrared absorption characteristics of graphene surface plasmons were studied,and the dispersion relationship of graphene surface plasmons was analyzed.Based on this expression,the factors that can affect the graphene surface plasmons are deduced,which are the nanostructure parameters,the number of graphene layers and the fermi energy level of graphene respectively,so as to change the conditions to achieve a higher absorption rate of the graphene surface plasmons.(2)The key technologies such as mirror preparation,electrode preparation,graphene nano-graphing and anodic alumina template transfer and etching were systematically studied.The graphene surface iso-excited components based on anodic alumina template were prepared.The feasibility of large-scale fabrication of nanostructures was verified by thermal field emission scanning electron microscopy and atomic force microscopy.(3)The infrared spectrum of the device was measured based on Fourier transform infrared spectrometer.A graphene surface iso-excited components was built based on the preparation of nanostructure with different parameters and based on single-layer single crystal graphene,double-layer single crystal graphene and three-layer single crystal graphene,so as to observe the absorption peak of graphene plasmons successfully.Then,a gel was applied on the device,and the fermi energy level of graphene was changed by applying gate pressure.The dynamic regulation of the graphene surface plasmons in the infrared band was realized.Finally,finite element simulation software COMSOL Multiphysics was used to numerically simulate the infrared absorption of graphene surface iso-excitation components.