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<p>In this study, a terahertz (THz) metamaterial absorber with polarization-insensitive properties has been proposed. The suggested structure shows a significant resonance behavior with high absorption efficiency and because of these features, it can be considered as a promising candidate for chemical sensing, environmental monitoring, and biomedical applications. Due to its sensitivity to variations in the refractive index (RI) of the surrounding media, the proposed structure is well-suited for detecting biological changes associated with early-stage cancer, non-invasive blood glucose monitoring, and identifying malaria vector interactions. The absorber consists of a three-layer configuration composed of a graphene top layer, a silicon dielectric spacer, and a gold back reflector. This layered design supports resonant absorption at specific THz frequencies which allows the efficient electromagnetic confinement. Simulation results demonstrate the excellent absorption rates of 99.6% at 0.98 THz and 99.4% at 1.2 THz. In this work, the frequency response is investigated to provide the insight into the physical mechanisms governing the absorption behavior. Furthermore, the sensor’s sensitivity to RI changes is evaluated to confirm its applicability in real-time biomedical sensing environments. The proposed THz metamaterial absorber offers a compact and a sensitive platform for the future development of integrated sensing devices in both biomedical and industrial fields.</p>

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Graphene-Based Polarization-Independent Dual-Band Absorber in Terahertz Biomedical Sensing Based on a Simple Ring Resonator

  • 期刊论文

  • 发表日期：

    2025年10月11日

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  • Mozhgun Moazzamnia,
  • Hanieh Hashemi Asl,
  • Sarah Poormohammad,
  • Aref Rasoulzadeh

摘要

In this study, a terahertz (THz) metamaterial absorber with polarization-insensitive properties has been proposed. The suggested structure shows a significant resonance behavior with high absorption efficiency and because of these features, it can be considered as a promising candidate for chemical sensing, environmental monitoring, and biomedical applications. Due to its sensitivity to variations in the refractive index (RI) of the surrounding media, the proposed structure is well-suited for detecting biological changes associated with early-stage cancer, non-invasive blood glucose monitoring, and identifying malaria vector interactions. The absorber consists of a three-layer configuration composed of a graphene top layer, a silicon dielectric spacer, and a gold back reflector. This layered design supports resonant absorption at specific THz frequencies which allows the efficient electromagnetic confinement. Simulation results demonstrate the excellent absorption rates of 99.6% at 0.98 THz and 99.4% at 1.2 THz. In this work, the frequency response is investigated to provide the insight into the physical mechanisms governing the absorption behavior. Furthermore, the sensor’s sensitivity to RI changes is evaluated to confirm its applicability in real-time biomedical sensing environments. The proposed THz metamaterial absorber offers a compact and a sensitive platform for the future development of integrated sensing devices in both biomedical and industrial fields.