title: Dual-band negative index metamaterial: double negative at 813 nm and single negative at 772 nm.
abstract: This work is concerned with the experimental demonstration of a dual-band negative index metamaterial. The sample is double negative (showing both a negative effective permeability and a negative effective permittivity) for linearly polarized light with a wavelength between 799 and 818 nm, and the real part of its refractive index is approximately -1.0 at 813 nm. The ratio of -Re(n)/Im(n) is close to 1.3 at 813 nm. For an orthogonal polarization, the same sample also exhibits a negative refractive index in the visible (at 772 nm). The spectroscopic measurements of the material are in good agreement with the results obtained from a finite-element electromagnetic solver for the actual geometry of the fabricated sample at both polarizations.
authors.affiliation: Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Uday K
authors.initials: UK
authors.lastname: Chettiar
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Kildishev
authors.forename: Hsiao-Kuan
authors.initials: HK
authors.lastname: Yuan
authors.forename: Wenshan
authors.initials: W
authors.lastname: Cai
authors.forename: Shumin
authors.initials: S
authors.lastname: Xiao
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Drachev
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Shalaev