Veeraselvam Aruna, Mohammed Gulam Nabi Alsath, Savarimuthu Kirubaveni, Anguera Jaume, Paul Jessica Constance, Krishnan Ram Kumar
Department of ECE, Sri Sivasubramaniya Nadar College of Engineering, Chennai 603110, India.
Department of ECE, Universitat Ramon Llull, 08028 Barcelona, Spain.
Sensors (Basel). 2021 Dec 6;21(23):8151. doi: 10.3390/s21238151.
In this paper, a graphene-based THz metamaterial has been designed and characterized for use in sensing various refractive index profiles. The proposed single-band THz sensor was constructed using a graphene-metal hybridized periodic metamaterial wherein the unit cell had a footprint of 1.395λ × 1.395λ and resonated at 4.4754 THz. The realized peak absorption was 98.88% at 4.4754 THz. The sensitivity of the proposed metamaterial sensor was estimated using the absorption characteristics of the unit cell. The performance of the sensor was analyzed under two different categories, viz. the random dielectric loading and chemical analytes, based on the refractive index. The proposed THz sensor offered a peak sensitivity of 22.75 GHz/Refractive Index Unit (RIU) for the various sample loadings. In addition, the effect of the sample thickness on the sensor performance was analyzed and the results were presented. From the results, it can be inferred that the proposed metamaterial THz sensor that was based on a refractive index is suitable for THz sensing applications.
本文设计并表征了一种基于石墨烯的太赫兹超材料，用于传感各种折射率分布。所提出的单波段太赫兹传感器采用石墨烯-金属混合周期性超材料构建，其中单元胞尺寸为1.395λ×1.395λ，在4.4754太赫兹处发生共振。在4.4754太赫兹处实现的峰值吸收率为98.88%。利用单元胞的吸收特性估算了所提出的超材料传感器的灵敏度。基于折射率，在随机介电负载和化学分析物这两种不同类别下分析了传感器的性能。对于各种样品负载，所提出的太赫兹传感器的峰值灵敏度为22.75 GHz/折射率单位（RIU）。此外，分析了样品厚度对传感器性能的影响并给出了结果。从结果可以推断，所提出的基于折射率的超材料太赫兹传感器适用于太赫兹传感应用。
