Negative refractive index response of weakly and strongly coupled optical metamaterials

TitleNegative refractive index response of weakly and strongly coupled optical metamaterials
Publication TypeJournal Article
Year of Publication2009
AuthorsZhou JF, Koschny T, Kafesaki M, Soukoulis CM
Journal TitlePhysical Review B
Volume80
Pages035109
Date Published07/01
ISBN Number1098-0121
Accession NumberISI:000268617800043
Keywordsfrequencies, magnetic response, wavelengths
Abstract

We present a detailed study of the retrieved optical parameters, electrical permittivity epsilon, magnetic permeability mu, and refractive index n of the coupled-fishnet metamaterial structures as a function of the separation between layers. For the weak-coupling case, the retrieved parameters are very close to the one-functional-layer results and converge relatively fast. For the strong-coupling case, the retrieved parameters are completely different from the one-unit fishnet results. We also demonstrate that the high value of the figure of merit [FOM = vertical bar Re(n)/Im(n)vertical bar] for the strongly coupled structures is due to the fact that the real part of the negative n moves away from the maximum of the imaginary part of n (close to the resonance), where the losses are high.

URL<Go to ISI>://000268617800043
DOI10.1103/Physrevb.80.035109