Dual and broadband terahertz metamateria absorber based on a compact resonator structure

In this paper, we present a novel design of a dual and broadband metamaterial absorber (MMA) based on a compact meander wire structure resonator in the terahertz (THz) region. The simulation results indicate that the absorbance is greater than 90% around 1.19 THz and 1.64-2.47 THz. The dual and broadband high level absorption mainly originates from the mixtures of the electric and magnetic resonance response with higher-orders of the proposed structure. The high absorption performance can be obtained at large angles of polarization and incidence for both transverse magnetic (TM) and transverse electric (TE) waves. Multiple reflection interference theory is used to analyze the mechanism of the MMA, and the theoretical results agree well with simulations. Furthermore, the absorption properties of the MMA can be adjusted easily by changing the geometric parameters of the unit-cell structure. Owing to its favorable performance, the proposed MMA could find many potential applications in bolometric imaging, stealth and communications in the THz region. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement