A Symmetrical Terahertz Triple-Band Metamaterial Absorber Using a Four-Capacitance Loaded Complementary Circular Split Ring Resonator and an Ultra-Thin ZnSe Substrate

Abdulkarim, Yadgar I.; Alkurt, Fatih Özkan; Awl, Halgurd N.; Altıntaş, Olcay; Muhammadsharif, Fahmi F.; Appasani, Bhargav; Bakır, Mehmet; Karaaslan, Muharrem; Taouzari, Mohamed; Dong, Jian

doi:10.3390/sym14071477

Cited by 16 publications

(7 citation statements)

References 60 publications

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“…As a result, the absorption response shows red shift phenomenon as the h s and a increases 15 . Table 4 compares previously reported studies 10,11,13,15,28,[46][47][48] with proposed MMA in terms of unit cell size, thickness, and resonating frequencies, indicating that the proposed MMA has seven absorption peaks with compact metallic structure, which is superior to previously reported MMA.…”

Section: Resultsmentioning

confidence: 80%

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

Jain

Chhabra

Chauhan

et al. 2023

Sci Rep

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A hepta-band terahertz metamaterial absorber (MMA) with modified dual T-shaped resonators deposited on polyimide is presented for sensing applications. The proposed polarization sensitive MMA is ultra-thin (0.061 λ) and compact (0.21 λ) at its lowest operational frequency, with multiple absorption peaks at 1.89, 4.15, 5.32, 5.84, 7.04, 8.02, and 8.13 THz. The impedance matching theory and electric field distribution are investigated to understand the physical mechanism of hepta-band absorption. The sensing functionality is evaluated using a surrounding medium with a refractive index between 1 and 1.1, resulting in good Quality factor (Q) value of 117. The proposed sensor has the highest sensitivity of 4.72 THz/RIU for glucose detection. Extreme randomized tree (ERT) model is utilized to predict absorptivities for intermediate frequencies with unit cell dimensions, substrate thickness, angle variation, and refractive index values to reduce simulation time. The effectiveness of the ERT model in predicting absorption values is evaluated using the Adjusted R2 score, which is close to 1.0 for nmin = 2, demonstrating the prediction efficiency in various test cases. The experimental results show that 60% of simulation time and resources can be saved by simulating absorber design using the ERT model. The proposed MMA sensor with an ERT model has potential applications in biomedical fields such as bacterial infections, malaria, and other diseases.

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Section: Resultsmentioning

confidence: 80%

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

Jain

Chhabra

Chauhan

et al. 2023

Sci Rep

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“…A triple‐band metamaterial absorber using a symmetrical four‐capacitance loaded complementary circular split ring resonator has been presented in Abdulkarim et al 12 The design demonstrates the perfect absorption at three resonance frequencies. Additionally, it has been reported that the absorber is not affected by polarization and incident wave angles.…”

Section: Introductionmentioning

confidence: 99%

A polarization‐insensitive metamaterial absorber for moisture‐sensing applications of agriculture products

Singh,

Sharma,

Gupta

et al. 2023

Micro & Optical Tech Letters

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This study evaluates the metamaterial absorbance and sensing applications of a novel wheel‐shaped resonator with triangular spokes. Electromagnetic simulation software, CST Microwave Studio, is used to investigate the numerical results before experimental verification. The proposed absorber exhibits perfect absorption properties at 10.42 GHz, with an absorbability of 99.85%. The designed sensor has been tested for estimating the moisture content of agricultural products, specifically almond kernels. The proposed prototype exhibits an excellent figure of merit and high sensitivity of 58.14 and 11.29 GHz/moisture content percentage, respectively. Additionally, the resonant peak of the sensor shifts by approximately 430 MHz when there is a 4% incremental alteration in the moisture content of the analyzed test sample. The designed sensor shows a high linearity in detecting small variations in moisture level, making it a favorable choice for sensing applications due to its compact size and flat shape.

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“…Various examples of these structures can be found in [6][7][8][9]. Noteworthy, the recently emerged structures of absorbers are based on metamaterial structures.…”

Section: Introductionmentioning

confidence: 99%

A novel terahertz metamaterial absorber based on split-relief design for the application of refractive index sensing

Abdulkarim

Muhammadsharif

Appasani

et al. 2023

Preprint

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Metamaterial (MM)-based designs have tremendous applications in terahertz (THz) frequency regimes. THz metamaterial absorbers are a subclass of metamaterial-based designs that can absorb the incident THz electromagnetic radiations in the THz band. In this paper, four different designs of THz metamaterial absorbers are proposed which are based on split-relief (SR) design. The designs consist of a sun-shaped, SR sun-shaped, star-shaped and SR star-shaped resonators coated on top of a dielectric substrate. The resonance frequencies of the designs were found to be 0.70, 1.04, 0.41 THz and 0.60 THz, respectively. Results showed that the resonance frequency was independent on the incident and polarization angles, making a unique metamaterial absorber. The proposed absorbers were used to sense the thickness of the analyte and its refractive index. The thickness of the analyte can be sensed with a sensitivity of 73 GHz/um for the Sun design, 238 GHz/um for the SRSun design, 45.2 GHz/um for the Star design, and 133.4 GHz/um for the SRStar design. Similarly, the refractive index of the analyte can be sensed with a sensitivity of 1.581 THz/RIU for the Sun design, 4.053 THz/RIU for the SRSun design, 1.077 THz/RIU for the Star design, and 2.067 THz/RIU for the SRStar design when the analyte thickness was fixed at 3 μm. Further, the resonance mechanism has been explained with the help of electric and magnetic field distributions. Due to their high sensitivity, these designs can have profound applications in biomedical sensing.

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A Symmetrical Terahertz Triple-Band Metamaterial Absorber Using a Four-Capacitance Loaded Complementary Circular Split Ring Resonator and an Ultra-Thin ZnSe Substrate

Cited by 16 publications

References 60 publications

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

A polarization‐insensitive metamaterial absorber for moisture‐sensing applications of agriculture products

A novel terahertz metamaterial absorber based on split-relief design for the application of refractive index sensing

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