| Original Articles |
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Negative and Superluminal Group Velocity Propagation with Narrow Pulse in a Coaxial Photonic Crystal |
| OU Xiao-Juan;ZHOU Wei;LI Lin;TENG Li-Hu;FENG Bao-Ying;ZHENG Sheng-Feng;WANG Feng-Wei |
| Department of Measurement and Instrument, Xidian University, Xi'an 710071 |
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| Cite this article: |
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OU Xiao-Juan, ZHOU Wei, LI Lin et al 2007 Chin. Phys. Lett. 24 624-627 |
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Abstract We investigate the propagation of electric signal along a spatially periodic impedance mismatched transmission line group. Anomalous dispersion is caused by the periodically mismatched impedance structure and a forbidden band appears near 8MHz in transmission. The group velocity of the amplitude-modulated signal is augmented up to infinity, even -3.89c (c the speed of light in vacuum) in the forbidden region with the amplitude of the modulated signal increasing. When the carrier sinusoid signal is modulated in amplitude by the modulating sinusoid signal, of which the peak is superimposed with a narrow pulse at fivefold frequency, the superluminal group velocity also occurs. The experiment failed to show whether the propagation velocity of narrow pulse exceeds c or not.
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| Keywords:
04.30.Nk
06.30.Gv
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Received: 20 November 2006
Published: 08 February 2007
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| PACS: |
04.30.Nk
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(Wave propagation and interactions)
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06.30.Gv
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(Velocity, acceleration, and rotation)
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