Guided mode resonance in terahertz compound metamaterial waveguides

Guided mode resonances (GMR) in a planar compound metamaterial (MM) consisting of two square closed ring resonators were numerically calculated and experimentally demonstrated. The strength and bandwidth of the GMR can be controlled by changing the distance between the two square rings. Moreover, asymmetric Fano resonance or electromagnetic induced transparency (EIT) was realized by manipulating the interaction between the GMR and the dipolar resonance of the MM. The measured results at terahertz frequencies are in good agreement with simulations.