Numerical Analysis on Ribbon-Array-Sheet Coupled Graphene Terahertz Absorber

Xing, Rui; Dong, Changbin; Zhu, Bofeng; Gao, Yixiao; Jian, Shuisheng

doi:10.1109/lpt.2016.2590822

Cited by 19 publications

(5 citation statements)

References 33 publications

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“…In fact, graphene films can act as resistive films [ 7 ] and, in addition, their conductivity can be tuned in order to obtain optimum absorption. For instance, numerical studies show that graphene ribbon arrays coupled with a graphene sheet can achieve a near unity absorption in a wide-THz bandwidth by changing graphene electrical properties through electrical doping due to an applied voltage [ 14 , 16 ]. A similar electrical doping has been investigated in [ 4 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the realization of periodic graphene nanostructures is still not an easy task. Recently, Salisbury absorber screens, consisting of a thin resistive film, a dielectric spacer and a backside reflector, have attracted growing interest for the realization of graphene-based THz absorbers [7,[13][14][15][16][17][18]. In fact, graphene films can act as resistive films [7] and, in addition, their conductivity can be tuned in order to obtain optimum absorption.…”

Section: Introductionmentioning

confidence: 99%

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Low-Terahertz Transparent Graphene-Based Absorber

2020

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A new, transparent, metal-free absorber, based on the use of multilayer graphene/dielectric laminates (GLs), is proposed for applications in the low-terahertz frequency range. The designed absorber has a total thickness of around 70 µm and consists of a front matching dielectric layer followed by a GL, a dielectric spacer and a back GL. The laminates are periodic structures constituted of graphene sheets separated by 50-nm-thick polyethylene terephthalate (PET) interlayers, while the matching layer and the spacer are one-quarter-wavelength thick and made of PET. The GLs are modeled as homogeneous-equivalent single layers (ESLs) characterized by their sheet resistances Rs. An innovative analytical method is proposed in order to select Rs values optimizing the electromagnetic wave absorption either in low-gigahertz or low-terahertz frequency range. The frequency spectra of the absorption, reflection and transmission coefficients are computed in the range up to 4 THz by using different values of Rs. Then, realistic Rs values of chemically doped graphene monolayers over PET substrates are considered. The designed absorbers are characterized by an absorption coefficient with a peak value of about 0.8 at the first resonant frequency of 1.1 THz, and a 1.4 THz bandwidth centered at 1.5 THz with reflection coefficient below - 10 dB. Moreover, the optical transmittance of the proposed absorbers are computed by means of the optical matrix theory and it is found to be greater than 86% in all the visible ranges.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Terahertz Transparent Graphene-Based Absorber

2020

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“…The value of R, L, and C can be estimated from ( 15) and ( 16) as: For maximum absorption condition, the impedance of the absorber should be equal to the characteristic impedance of free space as per maximum power transfer theorem i.e. Zin = Z0 = 377Ω in [5][6][7][8][9].…”

Section: Lmn;mentioning

confidence: 99%

“…n recent progresses, metamaterials have entered in various practical applications such as sensing, cloaking, stealth or absorber, and communication [1][2][3][4][5]. Among these applications absorbers have been found feasible and applicable in a microwave, terahertz as well as the infrared band for applications like terahertz and infrared imaging, perfect absorbers, wave manipulation, energy harvesting, chemical detection and, radioactive cooling.…”

Section: Introductionmentioning

confidence: 99%

Multi-Band Polarization Insensitive Ultra-Thin THz Metamaterial Absorber for Imaging and EMI Shielding Applications

Saxena

Khanna

Awasthi

et al. 2021

AEM

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this article, a multi-band polarization-insensitive metamaterial absorber is designed for THz imaging and EMI shielding. A unique oval-shaped structure with three circular ring-shaped resonators is proposed with a unit cell dimension of36×36×19.6μm3. The absorbance of the proposed multiband MMA is 98.57%, 90%and 99.85% at 5.58, 7.98-8.84, 11.45THz frequency respectively. Return loss is nearly the same for the changing incident and polarization angle. Therefore, this metamaterial absorber with a wide range of polarization insensitivity is found and it is also suitable for quantum RADAR Imaging, energy harvesting, and optoelectronic devices.

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“…In terahertz regime, graphene has better performance than conventional noble metal due to the support of surface plasmon polaritons (SPPs) propagation [2], which makes it a very promising candidate in terahertz technology. Therefore, in recent years, there emerged a great number of graphene-based devices in terahertz and mid-infrared regimes, such as modulators [3–6], detectors [7], absorbers [8, 9], and lasers [10, 11].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional graphene metasurface to generate and steer vortex waves

et al. 2019

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Graphene, an innovated 2D material with atomic thickness, is a very promising candidate and has drawn great attentions in various applications. Graphene metasurface enables dynamic control of various wavefronts, achieving distinguished functionalities. The flexibility of graphene metasurface makes it possible to implement multifunctional devices with ease. In this work, a novel design of multifunctional graphene metasurface, which can combine the functionalities of generating and steering vortex waves, has been proposed. The multifunctional graphene metasurface consists of a large array of graphene reflective unit cells. Each unit cell is controlled independently by its size and external static gate voltage. By scrutinizing the reflective property of the graphene cell, the graphene metasurface is designed to realize multi-functionalities. Simulation results show that vortex wave can be generated and steered. This work can establish a methodology to design multifunctional graphene metasurfaces, and the tunability of graphene opens the gate to the design and fabrication of reconfigurable graphene devices.

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Numerical Analysis on Ribbon-Array-Sheet Coupled Graphene Terahertz Absorber

Cited by 19 publications

References 33 publications

Low-Terahertz Transparent Graphene-Based Absorber

Low-Terahertz Transparent Graphene-Based Absorber

Multi-Band Polarization Insensitive Ultra-Thin THz Metamaterial Absorber for Imaging and EMI Shielding Applications

Multifunctional graphene metasurface to generate and steer vortex waves

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