Abstract

The performances of two localized pulses that have lately attracted attention are compared. The first localized field, the focus wave modes, was recently shown to be causally launchable from flat apertures characterized by having time-dependent radii. It is demonstrated that the second localized field, the X waves, can be also be generated from finite-time dynamic sources. A comparison of the decay patterns of the two wave fields is carried out. It is emphasized that such carrier-free pulses with ultrawide bandwidths can perform differently, even if they are excited by use of apertures with the same dimensions and with initial illumination wave fields of comparable frequency bandwidths. The propagation characteristics of such localized pulsed fields in the near- and far-field regions are studied. Based on an understanding of the spectral depletion of such pulses, a method is suggested to slow the decay rate of the pulses in the far-field region.

© 1997 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Spectral analysis of time-limited pulsed Gaussian wave fields

Amr M. Shaarawi, Sherif M. Sedky, Fawzia M. M. Taiel, Richard W. Ziolkowski, and Ioannis M. Besieris
J. Opt. Soc. Am. A 13(9) 1827-1836 (1996)

Diffraction length of localized waves generated by dynamic apertures

Sherif M. Sedky, Amr M. Shaarawi, Ioannis M. Besieris, and Fawzia M. M. Taiel
J. Opt. Soc. Am. A 13(8) 1719-1727 (1996)

Effect of the switching pattern of the illumination of dynamic apertures on the ranges of the generated localized waves

Amr M. Shaarawi, Sherif M. Sedky, Richard W. Ziolkowski, and Fawzia M. M. Taiel
J. Opt. Soc. Am. A 13(8) 1712-1718 (1996)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (45)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription