Dual-band negative index metamaterial: double negative at 813 nm and single negative at 772 nm.
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.
Chettiar
Uday K
UK
Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA.
Kildishev
Alexander V
AV
Yuan
Hsiao-Kuan
HK
Cai
Wenshan
W
Xiao
Shumin
S
Drachev
Vladimir P
VP
Shalaev
Vladimir M
VM