Characteristics of multi-mode resonances in T-shape air slots

Abstract

We investigate the characteristics of multi-mode resonances in T-shape air slots at terahertz frequencies. Our results show that the multimode resonance is caused by the structural complexity of the T-shape air slot resonators. Each resonance mode corresponds to a distribution of electric charges determined by the structural dimensions. Understanding the characteristics of multimode resonance may be useful for achieving versatile and custom-designed optical devices and realizing a wide variety of platforms with a high sensitivity for sensing biological materials.

Controllable Fano-like Resonance in Terahertz Planar Meta-Rotamers

“…The basic components (C-shaped SRR and Y-shaped rod) display optimal characteristics for fabricating the composite metamaterials, which can also be called meta-rotamers. The Y-shaped meta-atom is one of the simplest structures showing polarization-insensitive transmission or absorption properties because of its higher-order rotational symmetry and folded-slot resonators; moreover, it is available to fabricate multimode resonators and active control devices [28][29][30][31][32][33]. As shown in Figure 2a, the folded planar resonator consisting of two arms placed in the direction of polarization of the incident THz waves generates a dipole resonance with a resonant wavelength equal to twice the length of the metal rod [31].…”