Resonance hybridization in terahertz stacked metamaterials near Fano excitation threshold

We propose a unique deep-subwavelength spacer (cavity)-based terahertz (THz) stacked metamaterial to excite Fano resonance emanating without structural asymmetry. Our study shows depletion of Fano resonance intensity with decreasing cavity thickness. This study reveals fundamental relation between resonance hybridization and lattice effect in metasurfaces. We further demonstrate polymorphic resonance hybridization with variation of lattice parameters and materials in the metamaterial cavity near Fano excitation threshold, which can be significant in realization of THz multifunctional resonant devices to control properties of electromagnetic waves.