Controlling enhanced absorption in graphene metamaterial

Zhou, Qihui; Liu, Peiguo; Bian, Li-an; Liu, Hanqing; Liu, Chenxi; Chen, Genghui

doi:10.1016/j.optcom.2017.12.078

Cited by 35 publications

(24 citation statements)

References 45 publications

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“…It can be observed that the trend of the Q ‐factor at ω 1 shows a linear increase with a maximum value of 50. The abovementioned electromagnetic performance is better than that obtained for other THz‐metamaterial devices reported in the literature . This result can be explained by the field distributions for the PSM in the TE and TM modes, as shown in Figure c.…”

mentioning

confidence: 61%

“…There have been many novel inventions that have been greatly improved by using a THz metamaterial to replace classic devices, such as waveguides, resonators, filters, polarizers, and switches . To make a THz metamaterial more flexible and applicable, some progress has been made in the realization of controlling THz waves by using optical, electrical, magnetic, and thermal approaches. Among these approaches, a reconfigurable metamaterial becomes feasible in the active manipulation of THz wave applications.…”

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confidence: 99%

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A Stretchable Terahertz Parabolic‐Shaped Metamaterial

Lin

2019

Advanced Optical Materials

100

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A stretchable parabolic‐shaped metamaterial (PSM) coated onto polydimethylsiloxane (PDMS) is proposed and demonstrated for operation in the terahertz (THz) frequency range. By stretching the PDMS‐based PSM device along different directions, ultranarrowband, polarization dependent, switchable optical characteristics are obtained. By stretching the PSM width and length in the transverse electric (TE) and transverse magnetic (TM) modes, resonant tuning ranges of 0.55 and 0.32 THz, respectively, are demonstrated for the PSM device. In these deformation ranges, the Q‐factors of the PSM device for different widths and lengths are quite stable and maintained in the range of 9 to 14 for the TE mode, with a high Q‐factor of 50 obtained at resonance for the TM mode. The integration of the PSM on a mechanically deformable PDMS substrate provides potential for use in flexible electronics applications. Furthermore, the PSM device exhibits single‐/dual‐band switching and polarization switching characteristics. These multifunctional states for the PSM device can be determined by mechanical inputs to represent binary digits that can then be used to perform logic operations. Such a stretchable PSM device offers an effective approach for the realization of programmable metamaterials with enhanced optical‐mechanical performance due to its high flexibility, applicability, and cost‐effectiveness.

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confidence: 61%

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confidence: 99%

A Stretchable Terahertz Parabolic‐Shaped Metamaterial

Lin

2019

Advanced Optical Materials

100

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“…On one hand, continuous graphene layer can be combined with patterned metal [94][95][96][97] or dielectric layers [21,24,83,[98][99][100] to couple the incident wave into resonant mode. On the other hand, graphene can also be patterned into periodic unit cells to support a single [101] or multiple resonant modes [26,[102][103][104] for EM wave absorption. In some cases, both patterned graphene and metallic structures are utilized in the unit cell design [105,106].…”

Section: Graphene-based Metasurface Absorbersmentioning

confidence: 99%

“…The devices with two independently-tunable resonant frequencies at THz [125,126] and mid-infrared [127] frequencies are also explored with full-wave simulations, demonstrating excellent stability on one resonant frequency while the other frequency is tuned. In addition, by varying the chemical potential of graphene, some metasurface absorbers also exhibit switching performance and operate as either fine absorbers or reflectors [104,113,114,128,129]. It is worth mentioning that the thick dielectric layer in the range of micrometers used in some of these theoretical calculations are impractical for electrostatic doping [22,27,28,113].…”

Section: Reconfigurability Of Graphene Metasurface Absorbersmentioning

confidence: 99%

Implementation of Atomically Thick Graphene and Its Derivatives in Electromagnetic Absorbers

Tian

Shi

et al. 2019

Applied Sciences

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To reduce the radar cross section at microwave frequencies, it is necessary to implement electromagnetic (EM) absorbing devices/materials to decrease the strength of reflected waves. In addition, EM absorbers also find their applications at higher spectrum such as THz and optical frequencies. As an atomic-thick two-dimensional (2D) material, graphene has been widely used in the development of EM devices. The conductivity of graphene can be electrostatically or chemically tuned from microwave to optical light frequencies, enabling the design of reconfigurable graphene EM absorbers. Meanwhile, the derivatives of graphene such as reduced graphene oxide (rGO) also demonstrate excellent wave absorbing properties when mixed with other materials. In this article, the research progress of graphene and its derivatives based EM absorbers are introduced and the future development of graphene EM absorbing devices are also discussed.

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“…On the other hand, LSPs are subwavelength surface waves supported in materials whose characteristic dimensions are comparable to the excitation wavelength [29,30]. It is the latter that contributes to the absorption mechanism, and leads to the enhancement of absorption [31][32][33][34][35]. The migration of graphene electrons is described by the interband and intraband contributions, which are affected by the external electric fields and magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

A Tunable Terahertz Metamaterial Absorber Composed of Hourglass-Shaped Graphene Arrays

Zhang

Liu

et al. 2020

Nanomaterials

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In this paper, we demonstrate a tunable periodic hourglass-shaped graphene arrays absorber in the infrared (IR) and terahertz (THz) frequency bands. The effects of graphene geometric parameters, chemical potentials, periods, and incident angles on the pure absorption characteristics are studied by using the Finite Difference Time Domain (FDTD) method. In addition, this paper also analyzes the pure absorption characteristics of bilayer graphene arrays. The simulation results show that the maximum absorption reaches 38.2% for the monolayer graphene structure. Furthermore, comparing the bilayer graphene structure with the monolayer structure under the same conditions shows that the bilayer structure has a tunable dual-band selective absorption effect and has a higher maximum absorption of 41.7%. Moreover, it was found that there are dual-band tunable absorption peaks at 21.6 μ m and 36.3 μ m with the maximum absorption of 41.7% and 11%. The proposed structure is a convenient method which could be used in the design of graphene-based optoelectronic devices, biosensors, and environmental monitors.

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Controlling enhanced absorption in graphene metamaterial

Cited by 35 publications

References 45 publications

A Stretchable Terahertz Parabolic‐Shaped Metamaterial

A Stretchable Terahertz Parabolic‐Shaped Metamaterial

Implementation of Atomically Thick Graphene and Its Derivatives in Electromagnetic Absorbers

A Tunable Terahertz Metamaterial Absorber Composed of Hourglass-Shaped Graphene Arrays

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