Mode Coupling Properties of the Plasmonic Dimers Composed of Graphene Nanodisks

Chen, Houbo; Qiu, Weibin; Qiu, Pingping; Ren, Junbo; Lin, Zhihong; Wang, Jiaxian; Kan, Qiang; Pan, Jiaoqing

doi:10.3390/app7040359

Cited by 10 publications

(5 citation statements)

References 41 publications

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“…The low-frequency Fano dip gradually disappears by increasing the core permittivity. In the next simulations, optical properties of graphene material are manipulated in the experimentally realizable ranges, which is up to 3 ps for the relaxation time and up to 2 eV for chemical potential 48 . Based on Fig.…”

Section: Discussion and Resultsmentioning

confidence: 99%

Dual polarized engineering the extinction cross-section of a dielectric wire using graphene-based oligomers

Raad

Atlasbaf

2021

Sci Rep

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In this paper, graphene-coated spherical nanoparticles are arranged around an infinite length dielectric cylinder to enhance its extinction cross-section. Initially, a single longitudinal one-dimensional periodic array is considered in different loci concerning the transverse electric (TE) incident plane wave. It is observed that regardless of the position of the particles, the extinction cross-section of the dielectric cylinder is considerably enhanced with respect to the bare one. Later, by increasing the number of longitudinal plasmonic arrays around the cylinder, each residing in a different azimuthal direction, the extinction cross-section is further manipulated to observe double pronounced Fano resonances. The origin of the Fano resonances is described by considering their planar counterparts constructed by the periodic assembly of plasmonic oligomers. Finally, the hexamer configuration is considered as the prototype, and the effect of various optical, geometrical, and material parameters on the optical response is investigated in detail. Interestingly, due to the spherical symmetry of the cells, the extinction cross-section is also enhanced for the transverse magnetic (TM) incident wave, which is unattainable using a continuous plasmonic cover made of metal or graphene. The potential application of our proposed structure is in the design of reconfigurable conformal optical absorbers and sensors.

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Section: Discussion and Resultsmentioning

confidence: 99%

Dual polarized engineering the extinction cross-section of a dielectric wire using graphene-based oligomers

Raad

Atlasbaf

2021

Sci Rep

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“…Due to the constant radius in the simulations, the normalization of the ACS to the geometrical cross-section is not reported. In Table 2 , the graphene relaxation time is varied in the experimentally achievable range from τ= 0.5–2 ps 73 . Graphene relaxation time is inversely proportional to its scattering rate which is related to the purity of the sheet and can be controlled by experimental method to produce it 36 .…”

Section: Absorption Enhancement Using Epsilon-near-zero Cylindrical S...mentioning

confidence: 99%

“…By encapsulating graphene with molybdenum or tungsten disulfides and hBN, high carrier mobilities of about 60,000 cm 2 /Vs can be achieved. The mobility also depends on the chemical potential and the chemical potentials less than 2 eV are realizable 73 , 74 . The damping constant , which qualifies the losses in the graphene, is related to the mobility and chemical potential via .…”

Section: Absorption Enhancement Using Epsilon-near-zero Cylindrical S...mentioning

confidence: 99%

Efficient and high-quality absorption enhancement using epsilon-near-zero cylindrical nano-shells constructed by graphene

Raad,

Afshari-Bavil,

Liu

2024

Sci Rep

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This paper presents a detailed scattering analysis of a hollow-core plasmonic-shell cylindrical wire to design an efficient, compact, narrowband, and reconfigurable optical absorber. The shell is formed by a thin graphene material, investigated in its epsilon-near-zero (ENZ) plasmonic region. Compared to the graphene plasmonic resonances in the terahertz(THz)/far-infrared (FIR) frequencies, the ENZ plasmonic resonances offer a blue shift in the operating frequency of the second-order plasmonic resonances by increasing the geometrical dimensions. This feature is successfully used to design efficient optical wave absorbers with absorption cross-sections much larger than geometrical and scattering cross-sections. The observed blue shift in the resonance spectrum, which is the key point of the design, is further verified by defining each particle with its polarizability and fulfilling the resonant scattering condition in the framework of Mie’s theory. Furthermore, graphene relaxation time and chemical potential can be used to manipulate the absorption rate. Observed resonances have narrow widths, achieved with simple geometry. To consider more practical scenarios, the one-dimensional arrangement of the cylindrical elements as a dense and sparse array is also considered and the design key point regarding graphene quality is revealed. The quality factor of the sparse array resonance is 2272.8 and it demands high-quality graphene material in design. It is also observed that due to the use of small particles in the design, the near-field and cooperative effects are not visible in the absorption cross-section of the array and a clear single peak is attained. This polarization-insensitive absorber can tolerate a wide range of incident angles with an absorption rate above 90%.

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“…Most common plasmonic MMs are composed of gold and silver which exhibit negative real permittivity [ 16 ]. However, noble metals have relatively large ohmic loss and low flexibility that once the structure is fixed, the EM behaviors cannot be optimized further, which restricts the development of nanodevices based on plasmonic structures [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

A flexible control on electromagnetic behaviors of graphene oligomer by tuning chemical potential

et al. 2018

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In this work, we demonstrate that the electromagnetic properties of graphene oligomer can be drastically modified by locally modifications of the chemical potentials. The chemical potential variations of different positions in graphene oligomer have different impacts on both extinction spectra and electromagnetic fields. The flexible tailoring of the localizations of the electromagnetic fields can be achieved by precisely adjusting the chemical potentials of the graphene nanodisks at corresponding positions. The proposed nanostructures in this work lead to the practical applications of graphene-based plasmonic devices such as nanosensing, light trapping and photodetection.

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Mode Coupling Properties of the Plasmonic Dimers Composed of Graphene Nanodisks

Cited by 10 publications

References 41 publications

Dual polarized engineering the extinction cross-section of a dielectric wire using graphene-based oligomers

Dual polarized engineering the extinction cross-section of a dielectric wire using graphene-based oligomers

Efficient and high-quality absorption enhancement using epsilon-near-zero cylindrical nano-shells constructed by graphene

A flexible control on electromagnetic behaviors of graphene oligomer by tuning chemical potential

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