On the basis of Rayleigh-Sommerfeld vectorial diffraction formulas, we show that the radiation from a pulsed Gaussian planar source propagates at a slightly superluminal group velocity beyond the Rayleigh distance, in agreement with a recent prediction from the approximate paraxial theory of diffraction. Moreover, superluminality can be sizably enhanced up to velocities 1.5% faster than c (speed of a plane wave in vacuum) by diminishing the diameter of the source down to one wavelength.

Porras M A, Borghi R, & Santarsiero M (2002). Superluminality in Gaussian beams. OPTICS COMMUNICATIONS, 203, 183-189.

Superluminality in Gaussian beams

SANTARSIERO, Massimo
2002

Abstract

On the basis of Rayleigh-Sommerfeld vectorial diffraction formulas, we show that the radiation from a pulsed Gaussian planar source propagates at a slightly superluminal group velocity beyond the Rayleigh distance, in agreement with a recent prediction from the approximate paraxial theory of diffraction. Moreover, superluminality can be sizably enhanced up to velocities 1.5% faster than c (speed of a plane wave in vacuum) by diminishing the diameter of the source down to one wavelength.
Porras M A, Borghi R, & Santarsiero M (2002). Superluminality in Gaussian beams. OPTICS COMMUNICATIONS, 203, 183-189.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/125045
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