Tunable terahertz absorption in graphene-based metamaterial

Zhang, Qinfei; Ma, Qixiang; Yan, Shitao; Wu, Fengmin; He, Xiaodong; Jiang, Jiuxing

doi:10.1016/j.optcom.2015.05.017

Cited by 58 publications

(27 citation statements)

References 33 publications

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“…Until now, single-band [88,89,90], dual-band [91,92,93] and multi-band [94,95] perfect absorption structures based on graphene plasmons by using patterned or unpatterned [90,96] graphene in the mid-IR to THz band have been demonstrated. The absorption wavelength and absorbance of those structures can be dynamically tuned by the gating level of graphene [97,98,99,100,101,102], which is the key advantage compared with metallic perfect absorption structures.…”

Section: Perfect Absorption In the Mid-ir To Thz Bandmentioning

confidence: 99%

Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

Guo

Zhang

et al. 2018

Nanomaterials

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Graphene has unique properties which make it an ideal material for photonic and optoelectronic devices. However, the low light absorption in monolayer graphene seriously limits its practical applications. In order to greatly enhance the light absorption of graphene, many graphene-based structures have been developed to achieve perfect absorption of incident waves. In this review, we discuss and analyze various types of graphene-based perfect absorption structures in the visible to terahertz band. In particular, we review recent advances and optoelectronic applications of such structures. Indeed, the graphene-based perfect absorption structures offer the promise of solving the key problem which limits the applications of graphene in practical optoelectronic devices.

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Section: Perfect Absorption In the Mid-ir To Thz Bandmentioning

confidence: 99%

Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

Guo

Zhang

et al. 2018

Nanomaterials

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“…Graphene, as a material of single-layered carbon atoms arranged in a plane with honeycomb lattice, has excellent mechanical, chemical, and electrically tunable properties, which offer many interesting possibilities for terahertz and optical technologies. Especially, with the ability to support surface plasmons in the terahertz and infrared ranges, graphene has been applied in a wide range of terahertz and optical devices, such as polarizers [9], photodetectors [10,11], hyperlenses [12], modulators [13,14] and absorbers [15][16][17]. It is found that a single sheet of undoped graphene is highly transparent with the light absorbance of 2.3% [8,18].…”

Section: Introductionmentioning

confidence: 99%

Broadband absorber with periodically sinusoidally-patterned graphene layer in terahertz range

Ye¹,

Chen²,

Cai³

et al. 2017

Opt. Express

204

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We demonstrate that a broadband terahertz absorber with near-unity absorption can be realized using a net-shaped periodically sinusoidally-patterned graphene sheet, placed on a dielectric spacer supported on a metallic reflecting plate. Because of the gradient width modulation of the unit graphene sheet, continuous plasmon resonances can be excited, and therefore broadband terahertz absorption can be achieved. The results show that the absorber's normalized bandwidth of 90% terahertz absorbance is over 65% under normal incidence for both TE and TM polarizations when the graphene chemical potential is set as 0.7 eV. And the broadband absorption is insensitive to the incident angles and the polarizations. The peak absorbance remains more than 70% over a wide range of the incident angles up to 60° for both polarizations. Furthermore, this absorber also has the advantage of flexible tunability via electrostatic doping of graphene sheet, which peak absorbance can be continuously tuned from 14% to 100% by controlling the chemical potential from 0 eV to 0.8 eV. The design scheme is scalable to develop various graphene-based tunable broadband absorbers at other terahertz, infrared, and visible frequencies, which may have promising applications in sensing, detecting, and optoelectronic devices.

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“…Based on effective media theory, the complex permittivity ε ( ω ) and permeability μ ( ω ) of these MMAs can be changed when the conductivity of graphene sheet is effectively controlled by gate voltage or chemical doping [ 24 ]. Recently, some MMA-based-graphene have been proposed, which can achieve strong and tunable absorption by changing the chemical potential ( μ c ) [ 30 , 31 , 32 , 33 , 34 , 35 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. According to the well-known Kubo formula, the real part of permittivity of a graphene sheet is negative from THz to optical frequencies [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Design of a Broadband Tunable Terahertz Metamaterial Absorber Based on Complementary Structural Graphene

Huang

Cheng

et al. 2018

Materials

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We present a simple design for a broadband tunable terahertz (THz) metamaterial absorber (MMA) consisting of a complementary cross-oval-shaped graphene (CCOSG) structure and dielectric substrate placed on a continuous metal film. Both numerical simulation and theoretical calculation results indicate that the absorbance is greater than 80% from 1.2 to 1.8 THz, and the corresponding relative bandwidth is up to 40%. Simulated electric field and power loss density distributions reveal that the broadband absorption mainly originates from the excitation of continuous surface plasmon resonance (SPR) on the CCOSG. In addition, the MMA is polarization-insensitive for both transverse-electric (TE) and transverse-magnetic (TM) modes due to the geometry rotational symmetry of the unit-cell structure. Furthermore, the broadband absorption properties of the designed MMA can be effectively tunable by varying the geometric parameters of the unit-cell and chemical potential of graphene. Our results may find promising applications in sensing, detecting, and optoelectronic-related devices.

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Tunable terahertz absorption in graphene-based metamaterial

Cited by 58 publications

References 33 publications

Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

Broadband absorber with periodically sinusoidally-patterned graphene layer in terahertz range

Design of a Broadband Tunable Terahertz Metamaterial Absorber Based on Complementary Structural Graphene

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