dorsal/arxiv
View SchemaMorphology of the nonspherically decaying radiation beam generated by a rotating superluminal source
| Authors | Houshang Ardavan, Arzhang Ardavan, John Singleton, Joseph Fasel, Andrea Schmidt |
|---|---|
| Categories | |
| ArXiv ID | physics/0608132 |
| URL | https://arxiv.org/abs/physics/0608132 |
| DOI | 10.1364/JOSAA.24.002443 |
Abstract
We consider the nonspherically decaying radiation field that is generated by a polarization current with a superluminally rotating distribution pattern in vacuum, a field that decays with the distance $\subP{R}$ from its source as $\subP{R}^{-1/2}$, instead of $\subP{R}^{-1}$. It is shown (i) that the nonspherical decay of this emission remains in force at all distances from its source independently of the frequency of the radiation, (ii) that the part of the source that makes the main contribution toward the value of the nonspherically decaying field has a filamentary structure whose radial and azimuthal widths become narrower (as $\subP{R}^{-2}$ and $\subP{R}^{-3}$, respectively), the farther the observer is from the source, (iii) that the loci on which the waves emanating from this filament interfere constructively delineate a radiation `subbeam' that is nondiffracting in the polar direction, (iv) that the cross-sectional area of each nondiffracting subbeam increases as $\subP{R}$, instead of $\subP{R}^2$, so that the requirements of conservation of energy are met by the nonspherically decaying radiation automatically, and (v) that the overall radiation beam within which the field decays nonspherically consists, in general, of the incoherent superposition of such coherent nondiffracting subbeams. These findings are related to the recent construction and use of superluminal sources in the laboratory and numerical models of the emission from them. We also briefly discuss the relevance of these results to the giant pulses received from pulsars.
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"abstract": "We consider the nonspherically decaying radiation field that is generated by\na polarization current with a superluminally rotating distribution pattern in\nvacuum, a field that decays with the distance $\\subP{R}$ from its source as\n$\\subP{R}^{-1/2}$, instead of $\\subP{R}^{-1}$. It is shown (i) that the\nnonspherical decay of this emission remains in force at all distances from its\nsource independently of the frequency of the radiation, (ii) that the part of\nthe source that makes the main contribution toward the value of the\nnonspherically decaying field has a filamentary structure whose radial and\nazimuthal widths become narrower (as $\\subP{R}^{-2}$ and $\\subP{R}^{-3}$,\nrespectively), the farther the observer is from the source, (iii) that the loci\non which the waves emanating from this filament interfere constructively\ndelineate a radiation `subbeam\u0027 that is nondiffracting in the polar direction,\n(iv) that the cross-sectional area of each nondiffracting subbeam increases as\n$\\subP{R}$, instead of $\\subP{R}^2$, so that the requirements of conservation\nof energy are met by the nonspherically decaying radiation automatically, and\n(v) that the overall radiation beam within which the field decays\nnonspherically consists, in general, of the incoherent superposition of such\ncoherent nondiffracting subbeams. These findings are related to the recent\nconstruction and use of superluminal sources in the laboratory and numerical\nmodels of the emission from them. We also briefly discuss the relevance of\nthese results to the giant pulses received from pulsars.",
"arxiv_id": "physics/0608132",
"authors": [
"Houshang Ardavan",
"Arzhang Ardavan",
"John Singleton",
"Joseph Fasel",
"Andrea Schmidt"
],
"categories": [
"physics.optics"
],
"doi": "10.1364/JOSAA.24.002443",
"title": "Morphology of the nonspherically decaying radiation beam generated by a rotating superluminal source",
"url": "https://arxiv.org/abs/physics/0608132"
},
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