Design of symmetrical wide-angle graphene-based mid-infrared broadband perfect absorber based on circuit model

Abbasi, Maryam; Biabanifard, Mohammad; Abrishamian, Mohammad Sadegh

doi:10.1016/j.photonics.2019.100729

Cited by 16 publications

(10 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The near-unity absorption obtained by these structures; shows their potential in sensing and imaging applications. The absorption spectra is obtained by the full-wave numerical modeling (dash lines), the Finite Element Method (FEM) while the frequency-domain solver is exploited [51]- [53]. On the other hand, an easy to implement MATLAB code which represents the circuit model approach (solid lines) is performed.…”

Section: Resultsmentioning

confidence: 99%

Tunable Terahertz Graphene-Based Absorber Design Method Based on a Circuit Model Approach

et al. 2020

Self Cite

View full text Add to dashboard Cite

In this paper, a simple, fast, and novel method for designing a tunable terahertz absorber with arbitrary central frequency and desired fractional bandwidth is presented. The proposed absorber consists of a single layer periodic array of graphene ribbons (PAGRs), placed a quarter wavelength from a metallic ground, separated by a dielectric material. An analytical circuit model of the terahertz absorber is used to obtain analytical expressions for the input impedance of the proposed device. Then, a simple expression for determining the value of capacitance and the resonance conditions of the RLC circuit is used to achieve a terahertz absorber with arbitrary central frequency and desired fractional bandwidth. The proposed method is applicable for the design of both narrowband and broadband absorbers, with only one layer of graphene ribbons. Also, the presented method is applicable for designing ultra-wideband absorbers using multiple layered PAGRs. Full-wave numerical simulation is performed to verify the accuracy and validity of the presented method. Excellent performance of the proposed method in terms of computation time and memory resource and providing the desired terahertz absorber characteristics shows that our method is promising as a design approach for sensing, imaging and filtering applications.INDEX TERMS Terahertz absorber, tunable bandwidth, circuit model, transmission line method, graphene.

show abstract

Section: Resultsmentioning

confidence: 99%

Tunable Terahertz Graphene-Based Absorber Design Method Based on a Circuit Model Approach

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…In this article, a temperature of T = 300 K (room temperature) and τ = 0.5 ps are assumed. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Here in this work, a modified circuit model approach is used to describe layers exploiting developed circuit representation in Reference 26. According to References 26-30, periodic arrays of Nano-disks can be modeled via passive circuit elements while physical features and technology dependents parameters are embedded in-circuit elements.…”

Section: Proposed Configurationmentioning

confidence: 99%

“…So, the surface conductivity of graphene (with the assumption of exp[ jωt ] as the time‐harmonic dependency) can be written as:

σ_{g} ((),,,, ω, μ_{c}, τ, T) = - j \frac{e^{2} k_{B} T}{π h^{2} ((), ω - j τ^{- 1})} \times ([], \frac{μ_{c}}{k_{B} T} + 2 \ln ([], \exp ((), - \frac{μ_{c}}{k_{B} T}) + 1))

where e is the electron charge, k B is the Boltzmann constant, ℏ is the reduced Planck constant, τ is the relaxation time of electrons, μ c is the chemical potential, and T is the temperature. In this article, a temperature of T = 300 K (room temperature) and τ = 0.5 ps are assumed 11‐25 …”

Section: Proposed Configurationmentioning

confidence: 99%

See 1 more Smart Citation

Highly tunable multi‐band THz absorber with circuit model representation using multi‐bias scheme

Aghaee

Orouji

2020

Int J Numerical Modelling

View full text Add to dashboard Cite

Utilizing a double bias scheme for graphene patterns as a single layer, a THz meta-surface structure is proposed. The structure includes two dual bias layers and a graphene continuous sheet on top. So five possible biases are available which lead to a highly tunable absorption response. All consisting parts are modeled via passive circuit elements to obtain whole device input impedance. Then impedance matching theory is used to investigate potential frequencies for perfect absorption. Also, ample simulations are performed to show the validity and accuracy of theoretical descriptions. According to the simulation results in the conventional finite element method as a reference approach is in acceptable agreement with the developed circuit model approach. The proposed structure shows nearly perfect absorption in 5, 6, 7, and 8 THz with absorption rate over 90%. Such a tunable reaction is in incredible requests in optical systems and has various applications in structuring sensors, modulators, and photonic functions.

show abstract

“…Abiding by the above strategies of selecting materials and configurations, multiband and broadband absorbers were developed from the optical to microwave frequencies [7,10]. Particularly, in the infrared, many broadband absorbers utilizing surface plasmon phenomenon or electric/magnetic dipole resonances have been demonstrated [14,20,23,24]. However, the BWs of these absorbers are usually about the half of the center wavelength of the absorption band [14,15,[25][26][27] and in order to broaden the absorption BW, unit cells with additional material layers and top resonators are used leading to the larger unit cell dimensions and thicker structures [14,28].…”

Section: Introductionmentioning

confidence: 99%

Near-perfect broadband infrared metamaterial absorber utilizing nickel

Parsamyan¹

2020

Appl. Opt.

View full text Add to dashboard Cite

We propose a thin, compact, broadband, polarization and angle insensitive metamaterial absorber based on a tungsten reflector, silicon spacer and a top pattern composed of a double square-like ring resonator utilizing nickel (Ni). In such a structure, a high absorption (above 80 %) bandwidth ~ 4.8 m from 3.52 up to 8.32 m corresponding to the relative bandwidth ~81% can be achieved with deeply subwavelength unit cell dimensions. Here the physical origin of the broadband absorption is associated with low Q-factor dipole modes of the top pattern inner and outer sides functioning as rectangular nanoantennas. Owing to the structural symmetry, the absorber shows a good incidence angle tolerance in the relatively wide range for both TE and TM polarizations. The effective parameters of the Ni-based absorber were retrieved using the constitutive effective medium theory and the absorption characteristics of the effective medium and metamaterial were compared.

show abstract

Design of symmetrical wide-angle graphene-based mid-infrared broadband perfect absorber based on circuit model

Cited by 16 publications

References 44 publications

Tunable Terahertz Graphene-Based Absorber Design Method Based on a Circuit Model Approach

Tunable Terahertz Graphene-Based Absorber Design Method Based on a Circuit Model Approach

Highly tunable multi‐band THz absorber with circuit model representation using multi‐bias scheme

Near-perfect broadband infrared metamaterial absorber utilizing nickel

Contact Info

Product

Resources

About