Design of a graphene-based multi-band metamaterial perfect absorber in THz frequency region for refractive index sensing

Nickpay, Mohammad-Reza; Danaie, Mohammad; Shahzadi, Ali

doi:10.1016/j.physe.2021.115114

Cited by 46 publications

(14 citation statements)

References 79 publications

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“…There is a need for multi-band chiral absorbers in THz communication systems [15] when necessary to absorb more information through multibands. Similar needs of multi-band absorbers are in sensing [16,17], spectroscopy, and imaging [18] applications. However, most of the published chiral metamaterial absorbers are not graphenebased resonators, so their absorption spectra and chirality responses are not dynamically tunable.…”

Section: Introductionmentioning

confidence: 92%

Graphene-Based Multiband Chiral Metamaterial Absorbers Comprised of Square Split-Ring Resonator Arrays With Different Numbers of Gaps, and Their Equivalent Circuit Model

Asgari

Fabritius

2022

IEEE Access

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The equivalent circuit model (ECM) is developed by using a MATLAB code to analyze graphene-based multi-band chiral metamaterial absorbers composing graphene-based square split-ring resonator arrays in the terahertz (THz) range. The absorbers are simulated numerically by the finite element method (FEM) in CST Software to verify the ECM results. Our introduced multi-band absorbers can be used as suitable platforms in polarization-sensitive devices and systems in the THz range. We have designed four tunable graphene-based chiral metamaterial absorbers containing one, two, three, and four gaps in their arms, respectively. The absorber with one gap has four absorption bands (two for TE and three for TM, one band of both modes approximately overlaps) with absorption > 50%. The absorber with two gaps has three absorption bands (two for TE and two for TM, one band of both modes approximately overlaps). The absorber with three gaps has four absorption bands (three for TE and two for TM, one band of both modes approximately overlaps). The absorber with four gaps has three absorption bands (three for TE and two for TM, two bands of both modes approximately overlap). They work in the 1-5.5 THz with maximum linear dichroism (LD) responses of 98, 99, 89, and 77%, respectively. The designed absorbers are dynamically tunable. Additionally, by a 90• rotation of the incident electromagnetic fields, it is possible to switch between the number and/or location of absorption bands making these absorbers a promising candidate for future THz systems. ECM results are following the FEM ones. The proposed ECM procedure is a simple and fast way to recognize the characteristics of the designed absorbers. Our proposed absorbers could be promising enablers in future THz systems.

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Section: Introductionmentioning

confidence: 92%

Graphene-Based Multiband Chiral Metamaterial Absorbers Comprised of Square Split-Ring Resonator Arrays With Different Numbers of Gaps, and Their Equivalent Circuit Model

Asgari

Fabritius

2022

IEEE Access

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“…When the dielectric material is inserted in the appropriate position of the photonic crystal, the original periodicity of the photonic crystal is broken and defects occur, the defect is photon localized. Benefit from these unique advantages, they are used to design filter [5,6], sensor [7,8], optical fiber [9,10], absorber [11,12], etc.…”

Section: Introductionmentioning

confidence: 99%

Tunable bidirectional perfect THz absorber realized by graphene-based one-dimensional photonic crystals

et al. 2023

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In this paper, a perfect absorption structure of graphene-based one-dimensional photonic crystals (1DPC) with tunable absorption channels and absorptivity is proposed. The proposed structure can achieve four perfect absorption peaks with the absorptivity of 99.31%, 99.88%, 99.74% and 99.32% at the same time, and the absorptivity of all absorption peaks is more than 95%. By tuning the period number of 1DPC, the number of absorption peaks and absorption efficiency can be changed. In addition, we use this structure to design two different bidirectional absorbers. The designed bidirectional absorber can tailor the perfect absorption frequency with the absorptivity of more than 99.51%, and can change the absorption channel from single channel to double channel and double channel to multi-channel under the forward and backward incidence. This work not only fills the gap in the design of bidirectional perfect absorbers for 1DPC, but also provides a scheme for the design of multifunctional devices.

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“…By precise designing of the absorber structure and optimizing its geometric parameters and engineered layout, researchers can create multi-band or broadband absorbers with different characteristics such as polarization independent, adjustable, thin thickness, high absorption ratio and small dimensions (Kantamaneni et al, 2022;. Metamaterial absorber can be used in the terahertz field for chemical and biological sensing (Khani & Hayati, 2021;Khodadadi, Rezaei, Ghods, & Babaeinik, 2022;Nickpay, Danaie, & Shahzadi, 2022a). When an unknown material (analyte) is added to the absorbers, the analysis of the unknown material is performed by giving a response at the resonant frequency.…”

Section: Introduction 1-1 Metamaterials Perfect Absorbermentioning

confidence: 99%

Triple-band metamaterial perfect absorber for refractive index sensing in THz frequency

et al. 2023

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A triple-band metamaterial perfect absorber (MPA) is founded of monolayer graphene in THz region which is adjustable and polarization-independent is presented. The first layer of the structure from top contains of a graphene ring at the center of structure with four graphene wheel-shaped around it and four graphene triangles in the corner. This proposed structure has caused us to achieve 98.64%, 99.97% and 99.98% perfect absorptions peaks at 8.17 THz, 9.74 THz and 11.95 THz, respectively. We can vary the absorption peak frequencies to our desirable frequencies by changing the Fermi level of graphene. By tunining the incident angle waves up to 60 degrees, the frequency peaks and the value of absorption change slightly. Moreover, very significant matter about suggested absorber structure design is that it is polarization independent so by tuning the polarization angle, the frequency peaks and the value of absorption remain unchanged. These aspects make the suggested absorber proper for applications such as imaging, detecting, filtering and sensing. We have investigated the application of the MPA in the sensing of refractive index. The refractive index of the unknown material can be measured through shifts of frequency peaks. Based on the obtained results, it seems that the metamaterial perfect absorber is a good candidate for biosensors application.

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Design of a graphene-based multi-band metamaterial perfect absorber in THz frequency region for refractive index sensing

Cited by 46 publications

References 79 publications

Graphene-Based Multiband Chiral Metamaterial Absorbers Comprised of Square Split-Ring Resonator Arrays With Different Numbers of Gaps, and Their Equivalent Circuit Model

Graphene-Based Multiband Chiral Metamaterial Absorbers Comprised of Square Split-Ring Resonator Arrays With Different Numbers of Gaps, and Their Equivalent Circuit Model

Tunable bidirectional perfect THz absorber realized by graphene-based one-dimensional photonic crystals

Triple-band metamaterial perfect absorber for refractive index sensing in THz frequency

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