中国物理B ›› 2015, Vol. 24 ›› Issue (1): 15203-015203.doi: 10.1088/1674-1056/24/1/015203

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Tunable terahertz plasmon in grating-gate coupled graphene with a resonant cavity

闫博a b, 杨昕昕b, 方靖岳a, 黄永丹b, 秦华b, 秦石乔c   

  1. 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
  • 收稿日期:2014-08-18 修回日期:2014-10-11 出版日期:2015-01-05 发布日期:2015-01-05
  • 基金资助:

    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).

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   

  1. 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
  • Received:2014-08-18 Revised:2014-10-11 Online:2015-01-05 Published:2015-01-05
  • Contact: Qin Hua E-mail:hqin2007@sinano.ac.cn
  • Supported by:

    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).

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摘要：

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%.

关键词: finite-difference-time-domain simulation, graphene, plasmon, terahertz

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%.

Key words: finite-difference-time-domain simulation, graphene, plasmon, terahertz

中图分类号:  (Plasma simulation)

  • 52.65.-y
52.40.-w (Plasma interactions (nonlaser)) 73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))