Negative and Superluminal Group Velocity Propagation with Narrow Pulse in a Coaxial Photonic Crystal

Autor:	Feng Bao-Ying, Zhou Wei, OU Xiao-Juan, Teng Li-Hu, Li Lin, Wang Feng-Wei, Zheng Sheng-Feng
Rok vydání:	2007
Předmět:	Physics Amplitude Optics Transmission (telecommunications) business.industry Transmission line Pulse (signal processing) General Physics and Astronomy Velocity factor Group velocity business Slow light Signal
Zdroj:	Chinese Physics Letters. 24:624-627
ISSN:	1741-3540 0256-307X
Popis:	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 8 MHz 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6bb875fb560e04e8020fd25b4976f434 https://doi.org/10.1088/0256-307x/24/3/011 Zobrazit plný text záznamu