Triple-band terahertz metamaterial absorber with enhanced sensing capabilities

IF 1.5 4区物理与天体物理 Q3 OPTICS

The European Physical Journal D Pub Date : 2023-04-29 DOI:10.1140/epjd/s10053-023-00658-w

Shahzad Anwar, Qasim Khan, Ghafar Ali, Maaz Khan, Muhammad Maqbool

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Abstract

A triple-band perfect metamaterial absorber was achieved in terahertz regime that is made of asymmetric metallic I-shaped resonator and metallic ground layer with dielectric spacer in the middle. The simulated results show that the absorption device has three resonance modes at frequencies 1.655 THz, 1.985 THz and 2.86 THz with corresponding absorption rate closed to 95%. The origin of the triple-band absorber was investigated by electromagnetic field energy distribution. The absorption performance was further analyzed by the structural parameters to verify the underlying mechanisms of these absorption triple-band. Moreover, we also analyze the sensing performances of the absorber for the refractive index and the thickness of the analyte. Two conventional parameters, the sensitivity and figure of merit (FOM), were used to analyze the proposed design for the sensing performance of the device. The refractive index and thickness sensitivities of sensor are 1.2 THz/RIU and 0.0055 THz/µm, and the FOMs are 24.48 and 0.112 which is higher in magnitude compared to the first two resonant peaks and even higher than the resonance peaks of the previously reported works in terahertz regime. The proposed design has a number of applications in sensing, filter and stealth technology.

Graphical abstract

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具有增强传感能力的三波段太赫兹超材料吸收器

采用非对称金属i型谐振腔和中间有介电间隔的金属接地层，在太赫兹波段实现了三波段完美的超材料吸收体。仿真结果表明，该吸收装置在1.655 THz、1.985 THz和2.86 THz频率处有三种共振模式，相应的吸收率接近95%。利用电磁场能量分布分析了三波段吸波器的起源。进一步通过结构参数分析了吸收性能，验证了这些吸收三波段的潜在机制。此外，我们还分析了吸收剂对被分析物的折射率和厚度的传感性能。利用灵敏度和优值(FOM)这两个常规参数对该器件的传感性能进行了分析。传感器的折射率和厚度灵敏度分别为1.2 THz/RIU和0.0055 THz/µm, FOMs分别为24.48和0.112，其量级高于前两个谐振峰，甚至高于之前报道的太赫兹谐振峰。所提出的设计在传感、滤波和隐身技术方面有许多应用。图形抽象

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来源期刊

The European Physical Journal D 物理-物理：原子、分子和化学物理

CiteScore

3.10

自引率

11.10%

发文量

213

审稿时长

3 months

期刊介绍： The European Physical Journal D (EPJ D) presents new and original research results in: Atomic Physics; Molecular Physics and Chemical Physics; Atomic and Molecular Collisions; Clusters and Nanostructures; Plasma Physics; Laser Cooling and Quantum Gas; Nonlinear Dynamics; Optical Physics; Quantum Optics and Quantum Information; Ultraintense and Ultrashort Laser Fields. The range of topics covered in these areas is extensive, from Molecular Interaction and Reactivity to Spectroscopy and Thermodynamics of Clusters, from Atomic Optics to Bose-Einstein Condensation to Femtochemistry.