14 research outputs found
Propagation of time-truncated Airy-type pulses in media with quadratic and cubic dispersion
In this paper, we describe analytically the propagation of Airy-type pulses
truncated by a finite-time aperture when second and third order dispersion
effects are considered. The mathematical method presented here, based on the
superposition of exponentially truncated Airy pulses, is very effective,
allowing us to avoid the use of time-consuming numerical simulations. We
analyze the behavior of the time truncated Ideal-Airy pulse and also the
interesting case of a time truncated Airy pulse with a "defect" in its initial
profile, which reveals the self-healing property of this kind of pulse
solution.Comment: 9 pages. 5 figure
Focused X-shaped (Superluminal) pulses
The space-time focusing of a (continuous) succession of localized X-shaped
pulses is obtained by suitably integrating over their speed, i.e., over their
axicon angle, thus generalizing a previous (discrete) approach. First, new
Superluminal wave pulses are constructed, and then tailored in such a wave to
get them temporally focused at a chosen spatial point, where the wavefield can
reach for a short time very high intensities. Results of this kind may find
applications in many fields, besides electromagnetism and optics, including
acoustics, gravitation, and elementary particle physics.
PACS nos.: 41.20.Jb; 03.50.De; 03.30.+p; 84.40.Az; 42.82.Et; 83.50.Vr;
62.30.+d; 43.60.+d; 91.30.Fn; 04.30.Nk; 42.25.Bs; 46.40.Cd; 52.35.Lv.
Keywords: Localized solutions to Maxwell equations; Superluminal waves;
Bessel beams; Limited-diffraction pulses; Finite-energy waves; Electromagnetic
wavelets; X-shaped waves; Electromagnetism; Microwaves; Optics; Special
relativity; Localized acoustic waves; Seismic waves; Mechanical waves;
Elementary particle physics; Gravitational wavesComment: Latex file, with 6 Figure
Modern applications of the bateman-whittaker theory
[abstract not available
Modern applications of the bateman-whittaker theory
The Bateman-Whittaker theory, which was developed a century ago, is shown to be a comprehensive basis for deriving a large class of null spatiotemporally localized electromagnetic waves characterized by intriguing vortical structures. In addition, it provides the modeling for studying topological structures dealing with linked and knotted electromagnetic waves
Focused-X shaped pulses
The space–time focusing of a (continuous) succession of localized X-shaped pulses is obtained by suitably integrating over their speed, i.e., over their axicon angle, thus generalizing a previous (discrete) approach. New
superluminal wave pulses are first constructed and then tailored so that they become temporally focused at a chosen spatial point, where the wave field can reach very high intensities for a short time. Results of this kind may find applications in many fields, besides electromagnetism and optics, including acoustics, gravitation, and elementary particle physic
Generation of approximate focus-wave-mode pulses from wide-band dynamic Gaussian apertures
It is demonstrated that an approximation to the focus-wave-mode field can be generated from a dynamic Gaussian aperture. A source of this type is characterized by the time variation of its effective radius. The performance of such an aperture is studied in detail; it is demonstrated that the dynamic aperture shows a great enhancement over the corresponding static one. The types of source investigated provide an efficient scheme to launch narrow Gaussian pulses from extended apertures
Propagation of time-truncated airy-type pulses in media with quadratic and cubic dispersion
In this paper, we describe analytically the propagation of Airy-type pulses truncated by a finite-time aperture when second- and third-order dispersion effects are considered. The mathematical method presented here, which is based on the superposition of exponentially truncated Airy pulses, is very effective and allows us to avoid the use of time-consuming numerical simulations. We analyze the behavior of the time-truncated ideal Airy pulse and also the interesting case of a time-truncated Airy pulse with a “defect” in its initial profile, which reveals the self-healing property of this kind of pulse solution321017911796CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP312376/2013-8Sem informação2013/26437-