Optimization of the Fano Resonance Lineshape Based on Graphene Plasmonic Hexamer in Mid-Infrared Frequencies

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

doi:10.3390/nano7090238

Cited by 25 publications

(12 citation statements)

References 53 publications

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“…It can be seen that only one peak exists in the extinction spectrum of the hexamer. However, the line shape of the FR mode with two peaks and a dip appears when a central nanodisc is added into the hexamer, which can be demonstrated by two subgroup modes (the ring mode and the central mode) in our previous study [24]. Based on this nanostructure, additional ring nanodiscs (N = 12) with the chemical potential of 0.5 eV are added around the heptamer to constitute the PMMs (N = 19) for the ultimate research target.…”

Section: Fano Resonance Modes Induced By the Central Nanodisc And Thementioning

confidence: 72%

“…The extinction spectra with different µ c1 is plotted in Figure 5a. It is interesting that all the peaks are enhanced with the increase of µ c1 , which is different from the heptamer and hexamer [24]. For a given wavelength within the range of interest, the refractive index increases with the decreasing of the chemical potential of graphene.…”

Section: Modulation Depth Of the Tunable Frsmentioning

confidence: 92%

“…The surface conductivity σ g is a function of µ c , according to Equation (2). For a given frequency, n e f f of graphene decreases as the chemical potential increases [24], which results in the reduction of the confinement ability of the electromagnetic field. However, due to the relationship of µ ca3 > µ ca1 > µ ca2 , the confinement ability of the intermediate nanodisk to light is the strongest.…”

Section: The Relationship Between Frs and The Outer Ring Nanodiscsmentioning

confidence: 99%

“…FR with high local field enhancement [4] results from the coherent interference of the super-radiant bright mode and the subradiant dark mode [5,20], which has gained attention in noble 2 of 13 metal PMs [21][22][23]. At the same time, the independent subgroup mode is also used to understand the line shape of FR [6,17,24]. Usually, several modes are generated by breaking the spatial symmetry of the metal nanostructure, which makes it possible to observe multiple FRs in the spectrum [13,25,26].…”

Section: Introductionmentioning

confidence: 99%

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Multiple Fano Resonances with Tunable Electromagnetic Properties in Graphene Plasmonic Metamolecules

Zhou

Qiu

et al. 2020

Nanomaterials

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Multiple Fano resonances (FRs) can be produced by destroying the symmetry of structure or adding additional nanoparticles without changing the spatial symmetry, which has been proved in noble metal structures. However, due to the disadvantages of low modulation depth, large damping rate, and broadband spectral responses, many resonance applications are limited. In this research paper, we propose a graphene plasmonic metamolecule (PMM) by adding an additional 12 nanodiscs around a graphene heptamer, where two Fano resonance modes with different wavelengths are observed in the extinction spectrum. The competition between the two FRs as well as the modulation depth of each FR is investigated by varying the materials and the geometrical parameters of the nanostructure. A simple trimer model, which emulates the radical distribution of the PMM, is employed to understand the electromagnetic field behaviors during the variation of the parameters. Our proposed graphene nanostructures might find significant applications in the fields of single molecule detection, chemical or biochemical sensing, and nanoantenna.

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Section: Fano Resonance Modes Induced By the Central Nanodisc And Thementioning

confidence: 72%

Section: Modulation Depth Of the Tunable Frsmentioning

confidence: 92%

Section: The Relationship Between Frs and The Outer Ring Nanodiscsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiple Fano Resonances with Tunable Electromagnetic Properties in Graphene Plasmonic Metamolecules

Zhou

Qiu

et al. 2020

Nanomaterials

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“…Graphene oligomers constitute plasmonic molecules (PMs) via interactions between components, where the EM fields with strong field enhancements follow symmetries analogous to the coupling of atoms in chemical molecules [ 28 ]. By changing the chemical potential of graphene, the graphene PMs can reach high quality and flexibility [ 29 ]. However, there are more adjustable structure parameters such as chemical potential of graphene in different positions for graphene nanostructures to control the EM behaviors.…”

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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Plasmonically Modulated Gold Nanostructures for Photothermal Ablation of Bacteria

Guan

Win

Yang

et al. 2020

Adv Healthcare Materials

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With the wide utilization of antibiotics, antibiotic‐resistant bacteria have been often developed more frequently to cause potential global catastrophic consequences. Emerging photothermal ablation has been attracting extensive research interest for quick/effective eradication of pathogenic bacteria from contaminated surroundings and infected body. In this field, anisotropic gold nanostructures with tunable size/morphologies have been demonstrated to exhibit their outstanding photothermal performance through strong plasmonic absorption of near‐infrared (NIR) light, efficient light to heat conversion, and easy surface modification for targeting bacteria. To this end, this review first introduces thermal treatment of infectious diseases followed by photothermal therapy via heat generation on NIR‐absorbing gold nanostructures. Then, the usual synthesis and spectral features of diversified gold nanostructures and composites are systematically overviewed with the emphasis on the importance of size, shape, and composition to achieve strong plasmonic absorption in NIR region. Further, the innovated photothermal applications of gold nanostructures are comprehensively demonstrated to combat against bacterial infections, and some constructive suggestions are also discussed to improve photothermal technologies for practical applications.

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Optimization of the Fano Resonance Lineshape Based on Graphene Plasmonic Hexamer in Mid-Infrared Frequencies

Cited by 25 publications

References 53 publications

Multiple Fano Resonances with Tunable Electromagnetic Properties in Graphene Plasmonic Metamolecules

Multiple Fano Resonances with Tunable Electromagnetic Properties in Graphene Plasmonic Metamolecules

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

Plasmonically Modulated Gold Nanostructures for Photothermal Ablation of Bacteria

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