title: Comment on "Negative refractive index in artificial metamaterials".
abstract: We dispute Grigorenko's statement [Opt. Lett. 31, 2483 (2006)] that measuring only the reflection intensity spectrum is sufficient for determining the effective refractive index. In addition, our simulations do not confirm his conclusions regarding the negative refractive index and the negative permeability of the nanopillar sample in the visible range.
authors.affiliation: Birk Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA. Kildishev@purdue.edu
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Kildishev
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Drachev
authors.forename: Uday K
authors.initials: UK
authors.lastname: Chettiar
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Shalaev
authors.forename: Douglas H
authors.initials: DH
authors.lastname: Werner
authors.forename: Do-Hoon
authors.initials: DH
authors.lastname: Kwon