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.
Titolo: | Superluminality in Gaussian beams | |
Autori: | ||
Data di pubblicazione: | 2002 | |
Rivista: | ||
Citazione: | Porras M A, Borghi R, & Santarsiero M (2002). Superluminality in Gaussian beams. OPTICS COMMUNICATIONS, 203, 183-189. | |
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. | |
Handle: | http://hdl.handle.net/11590/125045 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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