Sat, 05 Jul 2008 12:20:39 BST CiteULike: dhbradshaw's polaritons http://www.citeulike.org/user/dhbradshaw/tag/polaritons CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dhbradshaw/article/2143161 <i>J. Opt. Soc. Am. A, Vol. 18, No. 7. (1 July 2001), pp. 1719-1725.</i><br /><br />A model-independent theorem demonstrates how a causal linear dielectric medium responds to the instantaneous spectrum, that is, the spectrum of the electric field pulse that is truncated at each new instant (as a given locale in the medium experiences the pulse). This process leads the medium to exchange energy with the front of a pulse differently than with the back as the instantaneous spectrum laps onto or off of nearby resonances. So-called superluminal pulse propagation in either absorbing or amplifying media as well as highly subluminal pulse propagation are understood qualitatively and quantitatively within this context. Role of the instantaneous spectrum on pulse propagation in causal linear dielectrics Justin Peatross Michael Ware Scott Glasgow J. Opt. Soc. Am. A, Vol. 18, No. 7. (1 July 2001), pp. 1719-1725. 2007-12-18T23:11:15-00:00 2001 J. Opt. Soc. Am. A 18 7 1719 1725 OSA group-index polaritons spontaneous-emission-paper