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<p>Terahertz (THz) wideband absorption is difficult to achieve, and it is frequently obtained from multilayered and multisized structures. In this paper, a low-profile, single-layer, and ultrathin metasurface absorber made of resistive material of ruthenium dioxide (RuO<sub>2</sub>) is presented. The proposed absorber is numerically analyzed by using a full-wave simulation tool, and its analytical mathematical model based on equivalent <i>RLC</i> components is constructed. This circuit-based formulation not only provides physical insight into the absorption mechanism, but also establishes a generalized mathematical framework that can be extended to other metasurface absorbers. We also considered two additional absorber designs to demonstrate the applicability of the circuit model approach. The absorber exhibits an outstanding absorption bandwidth from 2.9 THz to 4.8 THz with (<i>A</i> &gt; 90%). A detailed parametric analysis has been performed to observe the impact of various design parameters on the absorption trend. Furthermore, another mathematical interference theory-based multireflection model is developed to estimate its absorption and compare it with both simulation and circuit modeling results, demonstrating excellent consistency. Finally, the angular absorption performance of this absorber is also investigated by varying different oblique incident angles for both the Transverse electric (TE) and Transverse magnetic (TM) polarizations.</p>

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Mathematical Modeling and Parametric Analysis of Terahertz Wideband Absorber Comprising RuO2-Based Resistive Metasurfaces

  • 期刊论文

  • 发表日期：

    2025年11月9日

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  • Sultan S. Aldkeelalah,
  • Ammar Armghan

摘要

Terahertz (THz) wideband absorption is difficult to achieve, and it is frequently obtained from multilayered and multisized structures. In this paper, a low-profile, single-layer, and ultrathin metasurface absorber made of resistive material of ruthenium dioxide (RuO2) is presented. The proposed absorber is numerically analyzed by using a full-wave simulation tool, and its analytical mathematical model based on equivalent RLC components is constructed. This circuit-based formulation not only provides physical insight into the absorption mechanism, but also establishes a generalized mathematical framework that can be extended to other metasurface absorbers. We also considered two additional absorber designs to demonstrate the applicability of the circuit model approach. The absorber exhibits an outstanding absorption bandwidth from 2.9 THz to 4.8 THz with (A > 90%). A detailed parametric analysis has been performed to observe the impact of various design parameters on the absorption trend. Furthermore, another mathematical interference theory-based multireflection model is developed to estimate its absorption and compare it with both simulation and circuit modeling results, demonstrating excellent consistency. Finally, the angular absorption performance of this absorber is also investigated by varying different oblique incident angles for both the Transverse electric (TE) and Transverse magnetic (TM) polarizations.