Negative phase advance in polarization independent, multi-layer negative-index metamaterials.
We demonstrate a polarization independent negative-index metamaterial (NIM) at microwave frequencies. Transmission measurements and simulations predict a left-handed transmission band with negative permittivity and negative permeability. A negative-index is verified by using the retrieval procedure. Effective parameters of single-layer and two-layer NIMs are shown to be different. Negative phase advance is verified within the negative-index regime by measuring the phase shift between different sized negative-index metamaterials. Backward wave propagation is observed in the numerical simulations at frequencies where the phase advance is negative.
Nanotechnology Research Center, Department of Physics and Department of Electrical and Electronics Engineering, Bilkent University, Bilkent, 06800, Ankara, Turkey. aydin@fen.bilkent.edu.tr
Koray
K
Aydin
Zhaofeng
Z
Li
Levent
L
Sahin
Ekmel
E
Ozbay
D003198:Computer Simulation; D008027:Light; D008422:Materials Testing; D008962:Models, Theoretical; D055095:Optics and Photonics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation