CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Characterization of the radiation from single-walled zig-zag carbon nanotubes at terahertz range |
Wu Qun(吴群)a)d)†, Wang Yue(王玥)a)b), Wu Yu-Ming(吴昱明)c), Zhuang Lei-Lei(庄蕾蕾)b), Li Le-Wei(李乐伟)c), and Gui Tai-Long(桂太龙)b) |
a School of Electronics and Information Technology, Harbin Institute of Technology, Harbin 150001, China; b Department of Electronic Science and Technology, Harbin University of Science and Technology, Harbin 150080, China; c Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore; d State Key Laboratory of Millimeter Wave, Southeast University, Nanjing 211189, China |
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Abstract This paper investigates the radiation characteristics of metal single-walled zig-zag carbon nanotubes as a dipole antenna at terahertz wave range. The current distribution, input impedance and mutual impedance are calculated for various geometrical parameters of vertically-aligned carbon nanotubes. The numerical results demonstrate the properties of the antenna depending strongly on the geometrical parameters such as the radius, the lengths of carbon nantobues, and the spacing between nanotubes. It is found that the zig-zag carbon nanotubes exhibit very high input impedance and the mutual impedances for antenna array applications. These unique high impedance properties are different from the conventional metal thin wire antenna. The far-field patterns and gain of antenna array are also calculated. The maximum gain of array of 100-element array is up to 20.0 dB, which is larger than the gain of 0.598~dB of single dipole antenna at distance $d = 0.5\lambda $.
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Received: 31 March 2009
Accepted manuscript online:
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PACS:
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84.40.Ba
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(Antennas: theory, components and accessories)
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85.35.Kt
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(Nanotube devices)
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61.80.-x
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(Physical radiation effects, radiation damage)
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78.70.Gq
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(Microwave and radio-frequency interactions)
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Fund: Project supported by the National
Natural Science Foundation of China (Grant No.~60571026), the Open
Project of State Key Laboratory of Millimeter Wave (Grant
No.~K201006) and the Science and Technology Research Foundation of
Heilongjiang Education Bureau |
Cite this article:
Wu Qun(吴群), Wang Yue(王玥), Wu Yu-Ming(吴昱明), Zhuang Lei-Lei(庄蕾蕾), Li Le-Wei(李乐伟), and Gui Tai-Long(桂太龙) Characterization of the radiation from single-walled zig-zag carbon nanotubes at terahertz range 2010 Chin. Phys. B 19 067801
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