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.
- optical resonators
- finite difference time-domain analysis
- metallic thin films
- equivalent circuits
- infrared spectra