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.
Aydin
Koray
K
Nanotechnology Research Center, Department of Physics and Department of Electrical and Electronics Engineering, Bilkent University, Bilkent, 06800, Ankara, Turkey. aydin@fen.bilkent.edu.tr
Li
Zhaofeng
Z
Sahin
Levent
L
Ozbay
Ekmel
E
D003198:Computer Simulation; D008027:Light; D008422:Materials Testing; D008962:Models, Theoretical; D055095:Optics and Photonics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation