Broadband and wide angle near-unity absorption in graphene-insulator-metal thin film stacks

Zhang, H.J.; Zheng, Gaige; Chen, Y.Y.; Xu, Linhua

doi:10.1016/j.spmi.2018.03.040

Cited by 11 publications

(3 citation statements)

References 33 publications

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“…The refractive index of PMMA is 1.49 [ 36 ], and the complex refractive indices of the silver film are taken from Palik [ 37 ]. The planar graphene sheet consists of N layers of monolayer graphene, and the thickness of the graphene sheet is 3.4 nm as N = 10 [ 11 , 27 ]. The monolayer graphene is modeled as an infinitesimally thin surface with the surface conductivity σ g calculated from Kubo formula [ 38 , 39 ].…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, various approaches have been suggested to enhance light absorption of graphene in the visible and near-infrared regions, and the physical mechanisms behind the absorption enhancement of graphene include epsilon-near-zero effect [ 10 ], cavity resonance [ 11 – 13 ], attenuated total reflectance [ 14 ], guided-mode resonance [ 15 – 18 ], critical coupling [ 19 – 21 ], Fano resonance [ 22 , 23 ], plasmonic resonance [ 24 – 26 ], and magnetic resonance [ 27 – 29 ]. Unfortunately, the bandwidths of those absorbers are generally narrow due to their resonance nature.…”

Section: Introductionmentioning

confidence: 99%

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Angle-Insensitive Broadband Absorption Enhancement of Graphene Using a Multi-Grooved Metasurface

et al. 2019

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An angle-insensitive broadband absorber of graphene covering the whole visible spectrum is numerically demonstrated, which is resulted from multiple couplings of the electric and magnetic dipole resonances in the narrow metallic grooves. This is achieved by integrating the graphene sheet with a multi-grooved metasurface separated by a polymethyl methacrylate (PMMA) spacer, and an average absorption efficiency of 71.1% can be realized in the spectral range from 450 to 800 nm. The location of the absorption peak of graphene can be tuned by the groove depth, and the bandwidth of absorption can be flexibly controlled by tailoring both the number and the depth of the groove. In addition, broadband light absorption enhancement of graphene is robust to the variations of the structure parameters, and good absorption properties can be maintained even the incident angle is increased to 60°.Electronic supplementary materialThe online version of this article (10.1186/s11671-019-2937-7) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Angle-Insensitive Broadband Absorption Enhancement of Graphene Using a Multi-Grooved Metasurface

et al. 2019

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“…In the context of potential and plasmonic applications, the exploration of metal-graphene plasmons has recently attracted significant interest. For example, a broadband unity absorption in graphene-metal-insulator has been demonstrated in the visible and near infrared spectra [21]. Based on the graphene properties, the optimization of the surface plasmons resonance have been carried out in graphene-metal substrate and showed that such biosensor with N graphene layers is more sensitive than the conventional metal thin film surface plasmon resonance biosensor [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Role of Plasmon Modes on the Optical Reflectivity of Graphene-Metallic Structures: A Theoretical Approach

Linares¹,

Cruz

2019

JNanoR

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In recent years, the tunable plasmon modes in the terahertz region of a multilayer graphene structure interacting with a metallic film substrate have attracted significant interest motivated by the graphene´s unique optical and electronic properties and the possibility to enhance light-matter interaction. In this work, the plasmon waves in graphene layered systems on a conducting thin film are investigated, the hybrid graphene-metal metamaterialis surrounded by two semi-infinite materials with different dielectric constants ε1andε2, respectively. The dispersion relations of electronic collective excitations are calculated by the zeros of an effective dielectric constant obtained from a recursive relation for the amplitudes associated with the electric field between graphene layers in the metamaterial. Long-range Coulomb interactions based on the hybrid layered graphene-metal structure lead new set spectra of collective excitations. At long wavelength (q®0) the optical modes (w~q1/2)depend on the two-dimensional carrier density, the metallic thickness, the metallic substrate plasmon frequency, the number of the graphene layers and the dielectric constants in which the hybrid graphene-metal structure is embedded. This latter plays an important role in a wide range of applications such as a surface plasmon resonance biological sensors and terahertz surface plasmons in optically pumped graphene metamaterials.

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Double-mode absorption in double-defect photonic crystal with one graphene multilayer

et al. 2020

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Broadband and wide angle near-unity absorption in graphene-insulator-metal thin film stacks

Cited by 11 publications

References 33 publications

Angle-Insensitive Broadband Absorption Enhancement of Graphene Using a Multi-Grooved Metasurface

Angle-Insensitive Broadband Absorption Enhancement of Graphene Using a Multi-Grooved Metasurface

Role of Plasmon Modes on the Optical Reflectivity of Graphene-Metallic Structures: A Theoretical Approach

Double-mode absorption in double-defect photonic crystal with one graphene multilayer

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