High-Contrast Terahertz Wave Modulation by Gated Graphene Enhanced by Extraordinary Transmission through Ring Apertures
2014; American Chemical Society; Volume: 14; Issue: 3 Linguagem: Inglês
10.1021/nl4041274
ISSN1530-6992
AutoresWeilu Gao, Jie Shu, Kimberly S. Reichel, Daniel V. Nickel, Xiaowei He, Gang Shi, Róbert Vajtai, Pulickel M. Ajayan, Junichiro Kono, Daniel M. Mittleman, Qianfan Xu,
Tópico(s)Terahertz technology and applications
ResumoGate-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 ∼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 ∼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.
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