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Pulsed light beams in vacuum with superluminal and negative group velocities

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Porras, Miguel A. and Gonzalo Fonrodona, Isabel and Mondello, Alessia (2003) Pulsed light beams in vacuum with superluminal and negative group velocities. Physical review E, 67 (6). 066604/1-066604/9. ISSN 1539-3755

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Official URL: http://dx.doi.org/10.1103/PhysRevE.67.066604


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http://journals.aps.org/Publisher


Abstract

We study the group velocity of pulsed light beams in vacuum. Gouy's phase associated with the diffraction of transversally limited pulses can create a strong anomalous dispersion in vacuum leading to highly superluminal and negative group velocities. As a consequence, a focusing pulse can diverge beyond the focus before converging into it. The experimental feasibility is discussed.


Item Type:Article
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© 2003 The American Physical Society.

Uncontrolled Keywords:Propagation
Subjects:Sciences > Physics > Optics
ID Code:29892
Deposited On:30 Apr 2015 13:21
Last Modified:30 Apr 2015 13:21

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