Comment on "Negative refractive index in artificial metamaterials"

Alexander V. Kildishev, Birck Nanotechnology Center, Purdue University
V. P. Drachev, Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University
Uday K. Chettiar, Purdue University
V. M. Shalaev, Birck Nanotechnology Center and School of Electrical and Computer Engineering, Purdue University
D H. Werner, Department of Electrical Engineering, Pennsylvania State University
Do-Hoon Kwon, Department of Electrical Engineering, Pennsylvania State University

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.