Plasmonic Absorption Enhancement in Elliptical Graphene Arrays

被引：50

作者：

Chen, Jiajia ^{[1
,2
]}

Zeng, Yu ^{[1
,2
]}

Xu, Xibin ^{[3
]}

Chen, Xifang ^{[1
,2
]}

Zhou, Zigang ^{[1
,2
]}

Shi, Pengcheng ^{[1
,2
]}

Yi, Zao ^{[1
,2
]}

Ye, Xin ^{[3
]}

Xiao, Shuyuan ^{[4
]}

Yi, Yougen ^{[5
]}

机构：

[1] Southwest Univ Sci & Technol, Sch Sci, Mianyang 621010, Peoples R China

[2] Southwest Univ Sci & Technol, Joint Lab Extreme Condit Matter Properties, Mianyang 621010, Peoples R China

[3] China Acad Engn Phys, Res Ctr Laser Fus, Mianyang 621900, Peoples R China

[4] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Hubei, Peoples R China

[5] Cent South Univ, Coll Phys & Elect, Changsha 410083, Hunan, Peoples R China

来源：

NANOMATERIALS | 2018年 / 8卷 / 03期

基金：

中国国家自然科学基金;

关键词：

graphene surface plasmon; metamaterials; absorption enhancement; FDTD method; TERAHERTZ; MODULATION; ABSORBER;

D O I：

10.3390/nano8030175

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this paper, we come up with a wavelength tunable absorber which is made up of periodically elliptical graphene arrays in the far-infrared and terahertz regions. Through simulation, we find that we can increase the length of long axis of the ellipse, raise the incidence angles of TM- and TE-polarization (TM- and TE-polarization indicate the direction of the incident electric field along the direction of the x and the y axis, respectively.) within certain limits, and increase the chemical potential of graphene, so as to enhance the absorption of light in the elliptical graphene arrays. We also compare the absorption spectra of the original structure and the complementary structure, and find that the absorption of the original structure is higher than that of the complementary structure. In the end, we study the changes in the absorption rate of the double layer structure of the elliptical array with the increase in the thickness of SiO2. The elliptical array structure can be applied to tunable spectral detectors, filters and sensors at far-infrared and terahertz wavelengths.

引用

页数：8

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