Enhanced Sensing Capacity of Terahertz Triple-Band Metamaterials Absorber Based on Pythagorean Fractal Geometry

A new design of a triple band perfect metamaterial absorber based on Pythagorean fractal geometry is proposed and analyzed for terahertz sensing applications. The proposed design showed an enhanced sensing performance and achieved three intensive peaks at 33.93, 36.27, and 38.39 THz, corresponding t...

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Veröffentlicht in:Materials 2022-09, Vol.15 (18), p.6364
Hauptverfasser: Mazare, Alin Gheorghita, Abdulkarim, Yadgar I, Karim, Ayoub Sabir, Bakır, Mehmet, Taouzari, Mohamed, Muhammadsharif, Fahmi F, Appasani, Bhargav, Altıntaş, Olcay, Karaaslan, Muharrem, Bizon, Nicu
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container_title Materials
container_volume 15
creator Mazare, Alin Gheorghita
Abdulkarim, Yadgar I
Karim, Ayoub Sabir
Bakır, Mehmet
Taouzari, Mohamed
Muhammadsharif, Fahmi F
Appasani, Bhargav
Altıntaş, Olcay
Karaaslan, Muharrem
Bizon, Nicu
description A new design of a triple band perfect metamaterial absorber based on Pythagorean fractal geometry is proposed and analyzed for terahertz sensing applications. The proposed design showed an enhanced sensing performance and achieved three intensive peaks at 33.93, 36.27, and 38.39 THz, corresponding to the absorptivity of 98.5%, 99.3%, and 99.6%, respectively. Due to the symmetrical nature of the recommended design, the structure exhibited the characteristics of independency on the incident wave angles. Furthermore, a parametric study was performed to show the effects of the change in substrate type, resonator material, and substrate thickness on the absorption spectrum. At a fixed analyte thickness (0.5 μm), the resonance frequency of the design was found to be sensitive to the refractive index of the surrounding medium. The proposed design presented three ultra-sensitive responses of 1730, 1590, and 2050 GHz/RIU with the figure of merit (FoM) of 3.20, 1.54, and 4.28, respectively, when the refractive index was changed from 1.0 to 1.4. Additionally, the metamaterial sensor showed a sensitivity of 1230, 2270, and 1580 GHz/μm at the three resonance frequencies, respectively, when it was utilized for the detection of thickness variation at a fixed analyte refractive index (RI) of 1.4. As long as the RI of the biomedical samples is between 1.3 and 1.4, the proposed sensor can be used for biomedical applications.
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The proposed design showed an enhanced sensing performance and achieved three intensive peaks at 33.93, 36.27, and 38.39 THz, corresponding to the absorptivity of 98.5%, 99.3%, and 99.6%, respectively. Due to the symmetrical nature of the recommended design, the structure exhibited the characteristics of independency on the incident wave angles. Furthermore, a parametric study was performed to show the effects of the change in substrate type, resonator material, and substrate thickness on the absorption spectrum. At a fixed analyte thickness (0.5 μm), the resonance frequency of the design was found to be sensitive to the refractive index of the surrounding medium. The proposed design presented three ultra-sensitive responses of 1730, 1590, and 2050 GHz/RIU with the figure of merit (FoM) of 3.20, 1.54, and 4.28, respectively, when the refractive index was changed from 1.0 to 1.4. 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subjects Absorbers
Absorbers (materials)
Absorption spectra
Absorptivity
Aluminum
Angles (geometry)
Bandwidths
Biomedical materials
Boundary conditions
Capacity
Computer simulation
Design
Figure of merit
Fractal analysis
Fractal geometry
Fractals
Geometry
Graphene
Incident waves
Metamaterials
Optimization techniques
Refractivity
Resonance
Sensors
Software
Substrates
Terahertz frequencies
Thickness
title Enhanced Sensing Capacity of Terahertz Triple-Band Metamaterials Absorber Based on Pythagorean Fractal Geometry
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