期刊
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
卷 3, 期 5, 页码 550-557出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2013.2273415
关键词
Graphene; plasmonics; terahertz (THz)
资金
- NSF CAREER program [1149059]
- Army Research Office [W911NF-12-1-0071]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1149059] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0955013] Funding Source: National Science Foundation
We report on focusing of terahertz (THz) plasmons in two-dimensional electron gas (2DEG) at III-N heterostructures and in graphene by using planar circular grating lenses. Propagation of a broadband pulse of EM waves in 0.5-10 THz is studied by using finite difference time-domain (FDTD) approach. The results show that plasmonic modes excited by incident THz radiation are concentrated into lambda/180 area localized under the central disc. Electric field intensity under the central point is found to be orders of magnitude larger than the outer grating area. Optimal geometries for enhanced radiation coupling and plasmon focusing are investigated. Plasmonic lens modes supported by system has the advantage of tunability by an applied voltage to gratings. The large field enhancement by plasmonic confinement presents the potential for sub-wavelength imaging.
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