Graphene-based terahertz tunable plasmonic directional coupler

被引：37

作者：

He, Meng-Dong ^{[1
]}

Wang, Kai-Jun ^{[1
]}

Wang, Lei ^{[1
]}

Li, Jian-Bo ^{[1
]}

Liu, Jian-Qiang ^{[2
]}

Huang, Zhen-Rong ^{[3
]}

Wang, Lingling ^{[3
]}

Wang, Lin ^{[4
]}

Hu, Wei-Da ^{[4
]}

Chen, Xiaoshuang ^{[4
]}

机构：

[1] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Hunan, Peoples R China

[2] Jiujiang Univ, Coll Sci, Jiujiang 332005, Peoples R China

[3] Hunan Univ, Minist Educ, Key Lab Micronano Optoelect Devices, Changsha 410082, Hunan, Peoples R China

[4] Chinese Acad Sci, Natl Lab Infrared Phys, Shanghai Inst Tech Phys, Shanghai 200083, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 08期

基金：

中国国家自然科学基金;

关键词：

SURFACE-PLASMONS; METAMATERIALS; EXCITATION; TRANSMISSION; POLARITONS; RESONANCES; SPLITTER; ARRAYS; WAVES;

D O I：

10.1063/1.4894090

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We propose and numerically analyze a terahertz tunable plasmonic directional coupler which is composed of a thin metal film with a nanoscale slit, dielectric grating, a graphene sheet, and a dielectric substrate. The slit is employed to generate surface plasmon polaritons (SPPs), and the metal-dielectric grating-graphene-dielectric constructs a Bragg reflector, whose bandgap can be tuned over a wide frequency range by a small change in the Fermi energy level of graphene. As a graphene-based Bragg reflector is formed on one side of the slit, the structure enables SPP waves to be unidirectionally excited on the other side of the slit due to SPP interference, and the SPP waves in the Bragg reflector can be efficiently switched on and off by tuning the graphene's Fermi energy level. By introducing two optimized graphene-based Bragg reflectors into opposite sides of the slit, SPP waves can be guided to different Bragg reflectors at different Fermi energy levels, thus achieving a tunable bidirectional coupler. (C) 2014 AIP Publishing LLC.

引用

页数：5

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