| Superluminal and Negative Group Velocity in the Electromagnetic Wave Propagation |
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| 作者姓名： | Huang Zhixun Lu Guizhen Guan Jian |
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| 作者单位： | Department of Communication Engineering，Beijing Broadcasting Institute，Beijing 100024 |
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| 摘 要： | 1Introduction InthestudyoftheEMwavepropagationintheearly 1 9thcentury,thephasevelocityofwavesisbroughtforward ,whichisdefinedasthepropagationvelocityofthephaseofharmonicwavesandcanbewrittenas:Vp =ω β (1 )Whereβisaphaseconstant.In 1 839,W .R .Hamiltonbroughtforwardaconceptofgroupvelocitytoexplainsomeofsuchcomplexphenomenaastwowavesofdifferentfrequen ciespropagatetogetherinonemedium .In 1 877,Rayleighgavethedefinitionofthegroupvelocityinhisfamousbook“TheoryofSound”andthegroupvelocityis…
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| 关 键 词： | superluminal group velocity negative group velocity coaxial photonic crystal waveguide below cutoff(WBCO) |
Superluminal and Negative Group Velocity in the Electromagnetic Wave Propagation |
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| Huang Zhixun,Lu Guizhen,Guan Jian.Superluminal and Negative Group Velocity in the Electromagnetic Wave Propagation[J].Engineering Sciences,2003,1(2):35-39. |
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| Authors: | Huang Zhixun Lu Guizhen Guan Jian |
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| Institution: | Department of Communication Engineering, Beijing Broadcasting Institute, Beijing 100024 |
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| Abstract: | In this paper, a penetrating analysis is first made of the superluminal and negative group velocities that occur in the EM wave propagation. Discussed then are the superluminal and negative group velocities which are in the state of evanescent waves in the waveguide below cutoff(WBCO).Through an experiment in the coaxial photonic crystal a group velocity of 1.5-2.4 times the speed of light are observed in the stop band. |
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| Keywords: | superluminal group velocity negative group velocity coaxial photonic crystal waveguide below cutoff(WBCO) |
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