Tuning of Fano resonance in mirrored array of split ring resonators

Abstract

Fano-type resonances in arrays of mirror-symmetric planar split-ring resonators (SRRs) are investigated using frequency-domain terahertz spectroscopy, numerical simulations, and analytical modeling. Special attention is paid to the guided substrate modes, which are responsible for the excitation of Fano-type peaks in the far-field transmission spectra. We find that the number, frequency, and amplitude of Fano resonances can be effectively tuned by varying the substrate thickness and array period.