https://doi.org/10.1140/epjd/s10053-023-00658-w
Regular Article – Optical Phenomena and Photonics
Triple-band terahertz metamaterial absorber with enhanced sensing capabilities
1
Department of Physics, Islamia College Peshawar (Chartered University), Peshawar, Pakistan
2
College of Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, People’s Republic of China
3
Nanomaterials Research Group, Physics Division PINSTECH, 45650, Nilore, Islamabad, Pakistan
4
Health Physics Program, Department of Clinical and Diagnostic Sciences, University of Alabama at Birmingham, 35294, Birmingham, AL, USA
Received:
20
September
2022
Accepted:
18
April
2023
Published online:
29
April
2023
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.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
