Design of Quad-Band Terahertz Metamaterial Absorber Using a Perforated Rectangular Resonator for Sensing Applications

Abstract

Quad-band terahertz absorber with single-sized metamaterial design formed by a perforated rectangular resonator on a gold substrate with a dielectric gap in between is investigated. The designed metamaterial structure enables four absorption peaks, of which the first three peaks have large absorption coefficient while the last peak possesses a high Q (quality factor) value of 98.33. The underlying physical mechanisms of these peaks are explored; it is found that their near-field distributions are different. Moreover, the figure of merit (FOM) of the last absorption peak can reach 101.67, which is much higher than that of the first three absorption modes and even absorption bands of other works operated in the terahertz frequency. The designed device with multiple-band absorption and high FOM could provide numerous potential applications in terahertz technology-related fields.

High-Q Fano Resonance in Terahertz Frequency Based on an Asymmetric Metamaterial Resonator

“…Although the transmission at 0.809 THz is 26.45% in the proposed metasurface, it can be reduced further. According to [ 40 , 41 ], the utilization of lossy dielectric materials may reduce transmission. In our simulations, the substrate material we choose is an ideal material with a real refractive index of 1.5 that has no loss in terahertz region.…”

Coupled Resonance Enhanced Modulation for a Graphene-Loaded Metamaterial Absorber

“…The mechanism of perfect absorptions is clearly illustrated by the field distributions at the resonances. Because of the well-known metal-insulator-metal (MIM) structure [3, 32, 36–38] shown in Fig. 1, localized SPPs are stimulated to form compact magnetic resonances in each patch.…”

Design and Fabrication of a Triple-Band Terahertz Metamaterial Absorber

“…In order to regulate the electromagnetic wave, a large number of metamaterial devices have been confirmed. In particular, metamaterial absorbers have become a research hotspot because of their perfect absorption performance [ 12 , 13 , 14 ]. Metamaterial absorbers are designed for various devices, such as spatial light modulators [ 15 ], thermal emitters [ 16 ], multiplexing detector arrays [ 17 ], sensors [ 18 , 19 ], etc.…”