Characterisation at infrared wavelengths of metamaterials formed by thin-film metallic split-ring resonator arrays on silicon
The infrared reflectance spectra at normal incidence for split-ring resonator arrays fabricated in thin films of three different metals on a silicon substrate are reported. The results are compared with a finite difference time domain simulation of the structures and a simple and novel equivalent-circuit method for the calculation of the first and second resonant wavelengths.