Dynamically Tunable Dual-Frequency Terahertz Absorber Based on Graphene Rings

Su, Wei; Chen, Xinyue; Geng, Zhen

doi:10.1109/jphot.2019.2956053

Cited by 11 publications

(6 citation statements)

References 55 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An approximate relationship between the chemical potential and the bias voltage of a graphene sheet, is defined as 23

μ_{c} = normalℏ V_{f} \sqrt{\frac{{italicπε}_{0} ε_{r} V_{bias}}{{eh}_{r}}},

where V bias is the bias voltage, ε 0 is the permittivity of free space, V f is the Fermi velocity (≈10 6 m s −1 ), h r and ε r are the thickness and the permittivity of the dielectric, respectively.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Performance analysis of dynamically controllable terahertz grounded coplanar waveguide attenuator based on graphene using wave concept iterative process method

Hlali

Zairi

2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

In this paper, an efficient wave concept iterative process algorithm is proposed to analyze a dynamically controllable grounded coplanar waveguide attenuator based on graphene at terahertz frequencies. The proposed modeling technique of graphene is based on waves concept, that is based on redefining the boundary conditions (surface current and electric field) in terms of incident and reflected waves. The developed algorithm integrates both the interband and intraband conductivities without involving volumetric discretization. Therefore, it consumes less simulation time and computational resources. Numerical studies are conducted to validate the accuracy, speed, and usefulness of the proposed technique. Simulation results demonstrate that the interband term of the graphene conductivity has a significant effect and cannot be neglected in the simulation. The performance of the attenuator can be improved by controlling the chemical potential of graphene, which can achieve an attenuation range from 0.29 to 13.2 dB.

show abstract

“…An approximate relationship between the chemical potential and the bias voltage of a graphene sheet, is defined as 23

μ_{c} = normalℏ V_{f} \sqrt{\frac{{italicπε}_{0} ε_{r} V_{bias}}{{eh}_{r}}},

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…An approximate relationship between the chemical potential and the bias voltage of a graphene sheet, is defined as. 23 μ…”

Section: Effect Of the Interband Conductivitymentioning

confidence: 99%

Performance analysis of dynamically controllable terahertz grounded coplanar waveguide attenuator based on graphene using wave concept iterative process method

Hlali

Zairi

2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…70 Regarding the impact of environmental changes on the electromagnetic parameters of materials, researchers use the changes in electric field, magnetic field, and temperature to achieve dynamic adjustability. In recent years, commonly used materials are Dirac semimetal (BDS), 71,72 alum dioxide (VO 2 ), [73][74][75][76][77] and graphene, [78][79][80][81][82] wherein BDS is a novel topological quantum material. Similar to graphene, its Fermi energy and dielectric constant can be tuned through gate voltage.…”

Section: Dynamic Tunable Absorbermentioning

confidence: 99%

Structures, principles, and properties of metamaterial perfect absorbers

Zhao,

Wang,

et al. 2023

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…For most of the practical applications, tunable absorption is preferred. In the THz frequency range, the following active materials, such as graphene [21][22][23], thermal [24][25][26][27], phase change materials [28][29][30], and intensity tunable materials [31,32], are used for the controllable absorption.…”

Section: Introductionmentioning

confidence: 99%

Ultra-thin polarization independent broadband terahertz metamaterial absorber

Gandhi

Babu

Senthilnathan

2021

Front. Optoelectron.

View full text Add to dashboard Cite

In this work, we present the design of a polarization independent broadband absorber in the terahertz (THz) frequency range using a metasurface resonator. The absorber comprises of three layers, of which, the top layer is made of a vanadium dioxide (VO 2 ) resonator with an electrical conductivity of σ = 200000 S/m; the bottom layer consists of a planar layer made of gold metal, and a dielectric layer is sandwiched between these two layers. The optimized absorber exhibits absorption greater than 90% from 2.54 -5.54 THz. Thus, the corresponding bandwidth of the designed absorber is 3 THz. Further, the thermal tunable absorption and reflection spectra have been analyzed by varying the electrical conductivity of VO 2 . The impact of the various geometrical parameters on the absorption characteristics has also been assessed. The physics of generation of broadband absorption of the proposed device has been explored using field analysis. Finally, the absorption characteristics of the unit cell has been studied for various incident and polarization angles.

show abstract

Dynamically Tunable Dual-Frequency Terahertz Absorber Based on Graphene Rings

Cited by 11 publications

References 55 publications

Performance analysis of dynamically controllable terahertz grounded coplanar waveguide attenuator based on graphene using wave concept iterative process method

Performance analysis of dynamically controllable terahertz grounded coplanar waveguide attenuator based on graphene using wave concept iterative process method

Structures, principles, and properties of metamaterial perfect absorbers

Ultra-thin polarization independent broadband terahertz metamaterial absorber

Contact Info

Product

Resources

About