Tunable broadband multiresonance graphene terahertz sensor

Hajati, Yaser

doi:10.1016/j.optmat.2020.109725

Cited by 25 publications

(16 citation statements)

References 37 publications

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“…For N > 3, the absorption peak would be decreased. In this condition, the graphene loss surpasses the metal loss; therefore, more energy can pass to outer layers and causes the absorption peak to descend [ 3 , 32 ]. As a result, maximum 3 graphene layers are considered in the following structures.…”

Section: Resultsmentioning

confidence: 99%

“…In this structure, a layer of Au is coated above the graphene layer with the thickness of “G.” As discussed in the previous sections, adding an Au layer leads to the increased confinement of light which increases the absorption peak [ 3 , 32 ]. To discuss the effects of the added Au layer, its effects on the absorption spectrum are studied.…”

Section: Resultsmentioning

confidence: 99%

“…As can be seen in Fig. 11 , increasing RI would shift the absorption peak wavelength to higher amounts [ 3 , 16 , 37 ]. Considering the sensitivity relation [ Δλ/Δn (nm/RIU)], the sensitivity value of 570 nm/RIU can be achieved for this sensor.…”

Section: Resultsmentioning

confidence: 99%

“…These sensors can specifically be applied in healthcare systems, biotechnology labs, and other scientific regions [2]. Optical bio-sensors can be the result of the graphene-plasmonic combinations [3]. Plasmonic-graphene nano-structures can operate based on surface plasmon resonances (SPR) [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Sensitive Hemoglobin Concentration Sensor Based on Graphene-Plasmonic Nano-structures

2021

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In this paper, half-cylindrical-shaped rods are arranged in a row in order to form hemoglobin concentration sensors. The proposed structures can effectively detect hemoglobin concentrations in blood samples. Five individual structures based on graphene-plasmonic combinations are proposed and investigated. The proposed structures are made of different layers of Au, Ag, SiO 2 , and graphene. Different plates and cylindrical-shaped graphene layers are introduced in the structures to improve the functionality (absorption peak value and wavelength) of the absorber (sensor). Adding more Au layers strengthens the confinement of the incident electromagnetic waves and improves the absorption factor. Also, in the proposed structures, for improving the results, the effects of the chemical potential of graphene layers and “G” (graphene layer thicknesses) on the absorption peak and wavelength are considered. The final suggested structure indicates unity absorption peak and thus can be utilized in wide ranges of applications. As a refractive index bio-sensor, the structure is considered for detecting hemoglobin concentrations in blood samples which indicates a reasonable sensitivity factor of 570 nm/RIU.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sensitive Hemoglobin Concentration Sensor Based on Graphene-Plasmonic Nano-structures

2021

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“…To consider the third structure as the biosensor, the absorption spectrum for materials with different refractive indices (1.335, 1.357, 1.379 and 1.405) are shown in Fig. 14 (these refractive indices are related to different hemoglobin concentrations) [15]. The variation of absorption peak wavelength for the third proposal is the same as the first and second structures; increasing RI shift the wavelength to higher values [9,26]. For the present case, the sensitivity value of 3750nm/RIU can be achieved.…”

Section: Fig 13 Schematic Of the Absorption Spectrum Versus Wavelenmentioning

confidence: 99%

Design of Novel Sensitive Terahertz Biosensors Based on Graphene-Plasmonic Nanostructures

Chahkoutahi

Emami

2021

Preprint

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In this paper, four different configurations of sensitive biosensors based on graphene-plasmonic combinations are designed and proposed. The nanostructures are made of graphene, SiO2, aluminum and gold layers on a silicon substrate. Graphene-ring shaped structures with diagonal strips in vertical and horizontal directions are considered in the structures which greatly affect the absorption characteristics (absorption peak value and wavelength). Aluminum layer is used in the structure to prevent the transmission of light throughout some layers and improving the absorption factor. To promote the functionality of the structures, effects of the structural parameters (R1 and R2) and chemical potentials (Ef1, Ef2, Ef3 and Ef4) on the absorption peak-wavelength and its value, are also studied. The four individual configurations with different layers and strip directions demonstrate distinct and different wavelength ranges; structure-1: 45-60 µm, structure-2: 50-70 µm, structure-3: 70-85 µm, and structure-4: 80-100 µm. Thus, they can be utilized for wide categories of applications. Sensitivities of 1500nm/RIU, 2250/RIU, 3750nm/RIU and 4850nm/RIU are obtained for four types, respectively. The proposed structures indicate more sensitivities and they can be used in acceptable sensing characteristics for different applications like hemoglobin and glucose concentrations in blood samples and can be utilized as refractive index bio-sensing sensors.

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Carbon Nanomaterials: A Prominent Emerging Materials Towards Environmental Pollution Study and Control

Mishra

Mondal

Kumar

et al. 2021

Nanomaterials and Nanocomposites for Environmental Remediation

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Tunable broadband multiresonance graphene terahertz sensor

Cited by 25 publications

References 37 publications

Sensitive Hemoglobin Concentration Sensor Based on Graphene-Plasmonic Nano-structures

Sensitive Hemoglobin Concentration Sensor Based on Graphene-Plasmonic Nano-structures

Design of Novel Sensitive Terahertz Biosensors Based on Graphene-Plasmonic Nanostructures

Carbon Nanomaterials: A Prominent Emerging Materials Towards Environmental Pollution Study and Control

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