Miniaturized and Actively Tunable Triple-Band Terahertz Metamaterial Absorber Using an Analogy I-Typed Resonator

Abstract

Triple-band terahertz metamaterial absorber with design of miniaturization and compactness is presented in this work. The unit cell of the terahertz absorber is formed by an analogy I-typed resonator (a rectangular patch with two small notches) deposited on top of dielectric sheet and metallic mirror. The miniaturized structure design exhibits three discrete frequency points with near-perfect absorption at terahertz regime. The three absorption peaks could be ascribed to localized resonances of analogy I-typed resonator, while the response positions of these absorption peaks at the analogy I-typed resonator are different by analyzing the near-field patterns of these resonance peaks. Changes in structure parameters of the analogy I-typed resonator are also investigated. Simulation results revealed that the notch sizes of the rectangular patch are the key factor to form the triple-band near-perfect absorption. Further structure optimization is given to demonstrate triple-band polarization insensitive performance. Moreover, actively tunable absorption properties are realized by inserting or introducing vanadium dioxide with adjustable conductivity into the metamaterial structure. It is revealed that the insulator–metal phase transition of vanadium dioxide is the main reason for the modulation of absorption performance. Compared with previous multiple-band absorbers, the device given here has excellent features of high degrees of simplification, miniaturization, and active modulation, these are important in practical applications.

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

“…The proposed device has a simple structural design, less thickness, compact size, and narrow linewidth properties, suggesting sensing and detection applications. Table 1 compares the performance of nine relevant works with our work which clearly shows that the FOM and Q in our design outperform the previous work in Ref [31][32][33][35][36][37][38][39][40][41][42] . The fourth peak of absorption response has FOM of 44, full width at half maximum (FWHM) value of 0.05 THz, peak sensitivity of 2.2 THz/RIU, and Q-factor value of 117.…”

Graphene-based ultra-wideband absorber for terahertz applications using hexagonal split ring resonators

“…Since, Landy et al [11] provided the first simulated and numerical verification of an ideal metamaterial absorber (MA) in 2008, various types of MAs have been developed and explored. Absorbers with single, dual, and multiband responses have been used in recent years [12][13][14][15][16][17]. The large size of these nanostructures, however, increases the system size due to the large variation in the band gap of the components, and manufacture of these nanostructures is a complex procedure [18].…”

Ultra-Broadband Mid-Infrared Metamaterial Absorber Based on Multi-Sized Resonators

“…Since the first perfect metamaterial absorber (MA) was presented by Landy [ 14 ] in 2008, the EM metamaterial absorber research area has rapidly become popular, and many MAs have emerged. The absorption band of MAs has extended from the microwave band [ 15 ] to the terahertz [ 16 , 17 , 18 , 19 ], infrared [ 20 , 21 , 22 ], visible [ 23 ], and ultraviolet [ 24 ] bands. MAs have various features: tunable [ 25 ], cross-band absorption [ 26 ], polarization-insensitive [ 27 , 28 , 29 ], oblique-incidence [ 30 , 31 , 32 , 33 ], etc.…”