High-Q plasmonic graphene absorbers for electrical switching and optical detection

Liu, Zhengqi; Zhou, Jinchuan; Liu, Xiaoshan; Fu, Guolan; Liu, Guiqiang; Tang, Chaojun; Chen, Jing

doi:10.1016/j.carbon.2020.05.046

Cited by 36 publications

(10 citation statements)

References 63 publications

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“…Similarly, graphene as a two-dimensional material, shows a wavelength-independent absorption of ∼2.3% in the near-infrared and visible range. It has been proven that the coupling of graphene and nanostructures not only can enhance absorption − but also be used to achieve induced transparency, polarization conversion, enhancement of nonlinear absorption, and so on. To improve the absorption, the coupling between the metal nanostructure and the monolayer MoS 2 can significantly improve the absorbance of the nanosystem excited by linearly polarized light. − However, the above methods cannot achieve dynamic adjustment of CD signals.…”

Section: Introductionmentioning

confidence: 99%

Circular Dichroism Enhancement and Biosensing Application of Composite Dielectric Chiral Nanostructures

Wang

et al. 2021

J. Phys. Chem. C

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Chiral nanostructures with strong circular dichroism (CD) have been widely used in molecular detection, chemical analysis, and biosensing. However, how to enhance and dynamically adjust the CD signal of the chiral nanostructures is still a current challenge. Here, monolayer molybdic sulfide (MoS2) is introduced into the composite dielectric chiral nanostructures (CDCNs) composed of silicon–vanadium dioxide Z-shaped nanorods placed on the silica–silver substrate to enhance and dynamically adjust the CD signal. Results demonstrate that the coupling between CDCNs and MoS2 results in different absorption enhancing under different circularly polarized lights and strong CD effects. The surface electric field distribution of CDCNs/MoS2 reveals that the three CD signals are mainly due to the surface plasmon polariton on the surface of the silver and the guided mode resonance in silica along the x or y directions, respectively. The CD signals can be actively adjusted through the insulator–metal transition of vanadium dioxide. In addition, the coupling characteristics between different chiral molecules and CDCNs/MoS2 can be applied in the identification of chiral molecules. These results provide a new method for enhancing and dynamically adjusting CD signals and will promote the sensing of chiral molecules.

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Section: Introductionmentioning

confidence: 99%

Circular Dichroism Enhancement and Biosensing Application of Composite Dielectric Chiral Nanostructures

Wang

et al. 2021

J. Phys. Chem. C

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“…The graphene SPR mechanism is used to realize multi-mode perfect absorption. 30–32 In addition, the expression of dielectric constant of dart-type single-layer graphene is: 33,34 where: e = 1.6 × 10 −19 C is the charge of the electron, K B = 1.381 × 10 −23 J K −1 is the boltzmann constant, T = 300 K is the ambient room temperature, ħ = h /2π = 1.05 × 10 −34 J s is the reduced Planck constant, w represents the angular frequency of the incident wave, E F and τ represent the Fermi level and the relaxation time of the graphene layer.…”

Section: Structure Design and Numerical Modelmentioning

confidence: 99%

Multi-mode surface plasmon resonance absorber based on dart-type single-layer graphene

et al. 2022

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“…Due to the considerably good optical and electrical properties, graphene is known to hold a great promising potential in photoelectric devices, such as photodetectors, modulators, perfect absorbers, photovoltaics, photocatalysts, etc. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. However, the absorption efficiency of 2.3% is too low for the efficient operation of graphene-based photoelectric devices.…”

Section: Introductionmentioning

confidence: 99%

The Light Absorption Enhancement in Graphene Monolayer Resulting from the Diffraction Coupling of Surface Plasmon Polariton Resonance

Liu

Yan

et al. 2022

Nanomaterials

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In this study, we investigate a physical mechanism to improve the light absorption efficiency of graphene monolayer from the universal value of 2.3% to about 30% in the visible and near-infrared wavelength range. The physical mechanism is based on the diffraction coupling of surface plasmon polariton resonances in the periodic array of metal nanoparticles. Through the physical mechanism, the electric fields on the surface of graphene monolayer are considerably enhanced. Therefore, the light absorption efficiency of graphene monolayer is greatly improved. To further confirm the physical mechanism, we use an interaction model of double oscillators to explain the positions of the absorption peaks for different array periods. Furthermore, we discuss in detail the emerging conditions of the diffraction coupling of surface plasmon polariton resonances. The results will be beneficial for the design of graphene-based photoelectric devices.

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High-Q plasmonic graphene absorbers for electrical switching and optical detection

Cited by 36 publications

References 63 publications

Circular Dichroism Enhancement and Biosensing Application of Composite Dielectric Chiral Nanostructures

Circular Dichroism Enhancement and Biosensing Application of Composite Dielectric Chiral Nanostructures

Multi-mode surface plasmon resonance absorber based on dart-type single-layer graphene

The Light Absorption Enhancement in Graphene Monolayer Resulting from the Diffraction Coupling of Surface Plasmon Polariton Resonance

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