title: Negative refractive index in artificial metamaterials.
abstract: We discuss optical constants in artificial metamaterials showing negative magnetic permeability and electric permittivity and suggest a simple formula for the refractive index of a general optical medium. Using the effective-field theory, we calculate the effective permeability and the refractive index of nanofabricated media composed of pairs of identical gold nanopillars with magnetic response in the visible spectrum.
authors.affiliation: Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK. sasha@man.ac.uk
authors.forename: A N
authors.initials: AN
authors.lastname: Grigorenko