High-Contrast Terahertz Wave Modulation by Gated Graphene Enhanced by Extraordinary Transmission through Ring Apertures

被引：215

作者：

Gao, Weilu ^{[1
]}

Shu, Jie ^{[1
]}

Reichel, Kimberly ^{[1
]}

Nickel, Daniel V. ^{[1
]}

He, Xiaowei ^{[1
]}

Shi, Gang ^{[2
]}

Vajtai, Robert ^{[2
]}

Ajayan, Pulickel M. ^{[2
]}

Kono, Junichiro ^{[1
,2
,3
]}

Mittleman, Daniel M. ^{[1
]}

Xu, Qianfan ^{[1
]}

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

[2] Rice Univ, Dept Mat Sci & NanoEngn, Houston, TX 77005 USA

[3] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

来源：

NANO LETTERS | 2014年 / 14卷 / 03期

基金：

美国国家科学基金会;

关键词：

Graphene photonics; THz modulator; extraordinary optical transmission; near-field enhancement; high on/off ratio; METAMATERIALS; DEVICES; FILMS;

D O I：

10.1021/nl4041274

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Gate-controllable transmission of terahertz (THz) radiation makes graphene a promising material for making high-speed THz wave modulators. However, to date, graphene-based THz modulators have exhibited only small on/off ratios due to small THz absorption in single-layer graphene. Here we demonstrate a similar to 50% amplitude modulation of THz waves with gated single-layer graphene by the use of extraordinary transmission through metallic ring apertures placed right above the graphene layer. The extraordinary transmission induced similar to 7 times near-filed enhancement of THz absorption in graphene. These results promise complementary metal-oxide-semiconductor compatible THz modulators with tailored operation frequencies, large on/off ratios, and high speeds, ideal for applications in THz communications, imaging, and sensing.

引用

页码：1242 / 1248

页数：7

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