Journal
OPTICS COMMUNICATIONS
Volume 348, Issue -, Pages 66-70Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2015.03.032
Keywords
Terahertz; Graphene; Subwavelength grating
Categories
Funding
- National Basic Research Program of China [2014CB339800]
- National High Technology Research and Development Program of China [2011AA010205]
- National Natural Science Foundation of China [61171027]
- Science and Technology Program of Tianjin [13RCGFGX01127]
- Fundamental Research Funds for the Central University [14CX02020A]
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We have proposed an electrically controllable terahertz (THz) beam scanning device based on asymmetric graphene plasmonic grating. It is proved that the dispersion relation of surface plasmon waves can be efficiently manipulated on the periodic metal-dielectric-graphene plasmonic structure by an external bias voltage, and thus the derivation angle of the THz beam can be actively tuned. The numerical results show that the radiation angle of THz waves through this device can be tuned from -18 degrees to 18 degrees with the bias changing from 53.5 mV into 368.8 mV at the operating frequency of 0.5 THz. This electrically active beam scanning device has important application in the THz imaging, radar and communication systems. (C) 2015 Elsevier B.V. All rights reserved.
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