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Opt Lett. 2006 Dec 1;31(23):3532-4.

X-wave bullets with negative group velocity in vacuum.

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  • 1Departamento de Optica, Universidad de Valencia, Burjassot, Spain. carlos.zapata@uv.es

Abstract

Propagation-invariant, X waves with negative group velocity are reported. Beam aperturing allows for a comprehensive analysis concerning the causality of the optical signal and forerunner formation.

PMID:
17099774
[PubMed]
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