Papers Published

1. Smith, D.R. and Kroll, N., Negative refractive index in left-handed materials, Phys. Rev. Lett. (USA), vol. 85 no. 14 (2000), pp. 2933 - 6 [2933] .
   (last updated on 2007/04/16)

   Abstract:
   The real part of the refractive index n(ω) of a nearly transparent and passive medium is usually taken to have only positive values. Through an analysis of a current source radiating into a 1D “left-handed” material (LHM)-when the permittivity and permeability are simultaneously less than zero-we determine the analytic structure of n(ω), demonstrating frequency regions where the sign of Re[n(ω)] must, in face, be negative. The regime of negative index, made relevant by a recent demonstration of an effective LHM, leads to unusual electromagnetic wave propagation and merits further exploration

   Keywords:
   electromagnetic wave propagation;permittivity;refractive index;