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Titolo:
Role of group velocity in tracking field energy in linear dielectrics
Autore:
Ware, M; Glasgow, SA; Peatross, J;
Indirizzi:
Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA Brigham Young Univ Provo UT USA 84602 Phys & Astron, Provo, UT 84602 USA
Titolo Testata:
OPTICS EXPRESS
fascicolo: 10, volume: 9, anno: 2001,
pagine: 506 - 518
SICI:
1094-4087(20011105)9:10<506:ROGVIT>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
PULSE-PROPAGATION; LIGHT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Ware, M Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA Brigham Young Univ Provo UT USA 84602 Astron, Provo, UT 84602 USA
Citazione:
M. Ware et al., "Role of group velocity in tracking field energy in linear dielectrics", OPT EXPRESS, 9(10), 2001, pp. 506-518

Abstract

A new context for the group delay function (valid for pulses of arbitrary bandwidth) is presented for electromagnetic pulses propagating in a uniformlinear dielectric medium. The traditional formulation of group velocity isrecovered by taking a narrowband limit of this generalized context. The arrival time of a light pulse at a point in space is defined using a time expectation integral over the Poynting vector. The delay between pulse arrivaltimes at two distinct points consists of two parts: a spectral superposition of group delays and a delay due to spectral reshaping via absorption or amplification. The use of the new context is illustrated for pulses propagating both superluminally and subluminally. The inevitable transition to subluminal behavior for any initially superluminal pulse is also demonstrated. (C) 2001 Optical Society of America.

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Documento generato il 06/04/20 alle ore 01:59:02