PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Tunable terahertz plasmon in grating-gate coupled graphene with a resonant cavity |
Yan Bo (闫博)a b, Yang Xin-Xin (杨昕昕)b, Fang Jing-Yue (方靖岳)a, Huang Yong-Dan (黄永丹)b, Qin Hua (秦华)b, Qin Shi-Qiao (秦石乔)c |
a College of Science, National University of Defense Technology, Changsha 410073, China;
b Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, China;
c Opto-electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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Abstract Plasmon modes in graphene can be tuned into resonance with an incident terahertz electromagnetic wave in the range of 1-4 THz by setting a proper gate voltage. By using the finite-difference-time-domain (FDTD) method, we simulate a graphene plasmon device comprising a single-layer graphene, a metallic grating, and a terahertz cavity. The simulations suggest that the terahertz electric field can be enhanced by several times due to the grating-cavity configuration. Due to this near-field enhancement, the maximal absorption of the incident terahertz wave reaches up to about 45%.
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Received: 18 August 2014
Revised: 11 October 2014
Accepted manuscript online:
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PACS:
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52.65.-y
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(Plasma simulation)
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52.40.-w
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(Plasma interactions (nonlaser))
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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87.50.U-
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61271157), Jiangsu Planned Projects for Postdoctoral Research Funds, China (Grant No. 1301054B), and Suzhou Industry and Technology Bureau, China (Grant No. ZXG2012024). |
Corresponding Authors:
Qin Hua
E-mail: hqin2007@sinano.ac.cn
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Cite this article:
Yan Bo (闫博), Yang Xin-Xin (杨昕昕), Fang Jing-Yue (方靖岳), Huang Yong-Dan (黄永丹), Qin Hua (秦华), Qin Shi-Qiao (秦石乔) Tunable terahertz plasmon in grating-gate coupled graphene with a resonant cavity 2015 Chin. Phys. B 24 015203
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