Terahertz polarization-insensitive and all-optical tunable filter using Kerr effect in graphene disks arrays

Tabatabaei, F. S.; Biabanifard, Mohammad; Abrishamian, Mohammad Sadegh

doi:10.1016/j.ijleo.2018.11.103

Cited by 31 publications

(9 citation statements)

References 39 publications

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“…[2][3][4][5] In application point of view, THz metamaterial absorbers, the artificial subwavelength composite materials, play a key role in various types of devices, and the THz spectra have the potential of realizing these devices; some of the branches of these applications are indoor communications, sensing, biosensing, filtering, imaging, and medical applications. [6][7][8][9][10][11][12] However, the requirement of some applications is tunable narrowband THz absorbers, 13 while the requirement of the others is ultra-broadband absorbers, 14,15 and research in this area is ongoing. [16][17][18] Various geometrical structures including circular patches, 19 ring arrays, 20 graphene stacks, 21,22 rectangular fish-scale, 23 cascade metal-dielectric pairs, 24 and specific ring resonator 25 have been proposed to achieve ultra-wideband or broadband absorption.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, high electron mobility, marginal losses, and tunability of surface conductivity are among the unique optical properties of graphene . In application point of view, THz metamaterial absorbers, the artificial sub‐wavelength composite materials, play a key role in various types of devices, and the THz spectra have the potential of realizing these devices; some of the branches of these applications are indoor communications, sensing, biosensing, filtering, imaging, and medical applications . However, the requirement of some applications is tunable narrowband THz absorbers, while the requirement of the others is ultra‐broadband absorbers, and research in this area is ongoing .…”

Section: Introductionmentioning

confidence: 99%

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Circuit modeling of ultra‐broadband terahertz absorber based on graphene array periodic disks

Aghaee

Orouji

2019

Int J Numerical Modelling

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The realization of broadband absorption in the terahertz spectra is of significant interest in advanced terahertz applications. In this work, a novel ultrabroadband absorber based on the periodic array of graphene disks and graphene continues sheet is proposed. A developed transmission line theory besides the analytical circuit model of graphene disks and graphene continues sheet are exploited to describe the absorber structure by its circuit model. By using three graphene layers and considering impedance matching concept, the normalized bandwidth of 90% absorption is extended up to 121% of the central frequency. Also, the dependence of the absorption spectra on the structure parameters is investigated and analyzed. Moreover, the performance of the device under possible fabrication errors is discussed. In pursuit of evaluating the efficiency, accuracy, and validity of the proposed method, full-wave numerical modeling is performed by the finite element method. The results show that the proposed circuit approach, in addition to having advantages in terms of computing time and the need for memory resource, is in a good agreement with the full-wave simulations. Furthermore, the structure of the absorber is relatively simple, and it can be manufactured by chemical vapor deposition techniques.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Circuit modeling of ultra‐broadband terahertz absorber based on graphene array periodic disks

Aghaee

Orouji

2019

Int J Numerical Modelling

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“…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%

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

Aghaee

Orouji

2020

Int J Numerical Modelling

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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.

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“…These applications require the ability to flexibly manipulate terahertz wave in free space. Over the past several years, many kinds of terahertz wave devices have been reported such as filter [7], polarizer [8], power divider [9], modulator [10], absorber [11], switch [12], etc. As the core device of terahertz wave system, terahertz wave switch has received significant attention.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Switch Utilizing Inorganic Perovskite-Embedded Metasurface

Xiong

Peng²,

2020

Front. Phys.

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Various applications of terahertz technology require a large number of various terahertz wave control devices. Yet, high efficient and rapid-response terahertz switch is still a great challenge. Here, we introduce a new scheme, based on inorganic perovskite quantum dot (CsPbBr 3-QD)-embedded metasurface under different pump laser powers that realize terahertz wave high-speed switching performance. The off-on speed of the presented device achieves 8 MHz. This kind of components provides a new idea and a cost-effective functional solution for manipulating the terahertz waves in emerging terahertz devices and systems.

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Terahertz polarization-insensitive and all-optical tunable filter using Kerr effect in graphene disks arrays

Cited by 31 publications

References 39 publications

Circuit modeling of ultra‐broadband terahertz absorber based on graphene array periodic disks

Circuit modeling of ultra‐broadband terahertz absorber based on graphene array periodic disks

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

Terahertz Switch Utilizing Inorganic Perovskite-Embedded Metasurface

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