Refractive-index sensitivities of hybrid surface-plasmon resonances for a core-shell circular silver nanotube sensor

Velichko, Elena A.; Nosich, Alexander I.

doi:10.1364/ol.38.004978

Cited by 64 publications

(27 citation statements)

References 13 publications

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“…Besides, the role of the natural modes in the modification of the scattering and absorption remains not studied. It is expected to be similar to the behavior, in the visible range, of a layered dielectric cylinder with a deposited on it layer of silver or gold [9,10]. This enables one to think about the application of a graphene-covered microsize tube as a sensor of refractive index, similarly to noble-metal nanotubes however in the terahertz range instead of optical frequencies.…”

Section: Introductionmentioning

confidence: 78%

“…Here, a hollow dielectric tube with a graphene shell was immersed into and filled in with an analyte medium of a varying refractive index. There are two most important engineering characteristics of optical or THz-wave-range sensors of the refractive index change: the sensitivity and the figure-of-merit (FOM) [9]. We will define the bulk refractive index sensitivity as / , where FWHM is the full width at half maximum of the peak at the fixed value of host n .…”

Section: Icton 2015mentioning

confidence: 99%

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THz wave scattering and absorption by a dielectric tube with a graphene cover

Velichko

2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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We study the scattering and absorption of the H-polarized plane wave by a dielectric tube with a graphene cover in the THz range. The tube is assumed to have circular cross-section. The analytical solution of the wavescattering problem is based on the Maxwell equations and using the separation of variables in the polar coordinates. We assume the resistive boundary conditions on the zero-thickness graphene cover, where the graphene electron conductivity is included as a parameter and determined from the Kubo formalism. The computed spectra of the total scattering cross-section and absorption cross-section display two different types of resonances: the localized-surface-plasmon (LSP) resonances of the graphene shell and resonances on conventional modes of a dielectric tube. The computed data can be useful for the design of graphene-based sensors of the changes in refractive index of host medium. For this purpose, the sensitivities and the figure-ofmerit values of the LSP resonances are computed.

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Section: Introductionmentioning

confidence: 78%

Section: Icton 2015mentioning

confidence: 99%

THz wave scattering and absorption by a dielectric tube with a graphene cover

Velichko

2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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“…The enhanced surface plasmon resonance in noble metallic systems at optical frequencies is expected to be a promising issue for realizing excellent scatterers and absorbers of the visible light [5][6][7][8]. Recently, much attention has been paid to the light scattering from metal-dielectric layered structures, because of their promising applications in sensors [9], super-scattering [10] and invisible cloaking [11,12]. Surface plasmons are accompanied by localized enhancement of the electromagnetic field.…”

Section: Introductionmentioning

confidence: 99%

Scattering of Light by the Metal-Coated Dielectric Nanocylinders With Angular Periodicity

Jandieri

Yasumoto²,

Liu³

et al. 2016

PIER M

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Abstract-Scattering of light by metal-coated dielectric nanocylinders periodically distributed along a cylindrical surface is investigated both theoretically and numerically. The structure is under the authors' interest because of its practical application in design and fabrication of plasmonic devices such as plasmonic ring resonators, Plasmonic Crystals and THz waveguides. The method is based on the T-matrix approach and the field expansion into the cylindrical Floquet modes. The method is rigorous, straightforward and can be easily applied to various cylindrical configurations with different types and locations of the excitation sources. Scattering cross section and absorption cross section of three and four silver (Ag) coated-dielectric nanocylinders periodically situated along a cylindrical surface are studied. Near field distributions are investigated at particular wavelengths corresponding to the resonance wavelengths in the spectral responses. Special attention is paid to the unique and interesting phenomena characterizing the cylindrical structure composed of the metal-coated nanocylinders such as: a ) localization of the field at the outer and inner interfaces of the metal-coated nanocylinders; b) excitement of the field in the gap region between the nanocylinders through the coupled plasmon resonance and c) strong confinement of the field inside the cylindrical structure. Detailed investigations have shown that unique phenomena characterizing the cylindrical configurations of the nanocylinders can be realized using a relatively simple structure composed of three nanocylinders and there is no need to further increase a number of the scatterers (nanocylinders).

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“…The surface plasmons characterize the unique response in collective motions of electrons on a metal-dielectric interface, which is allowed when the permittivity of the metal is negative for the wavelength of excitation. Recently, much attention has been paid to the light scattering from metal-dielectric layered structures, because of their promising applications in sensors [8], super-scattering [9], and invisible cloaking [10,11].…”

Section: Introductionmentioning

confidence: 99%

Scattering of light by gratings of metal-coated circular nanocylinders on a dielectric substrate

et al. 2015

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Light scattering by a grating of the metal (Ag)-coated nanocylinders supported on the dielectric substrate is investigated using an accurate and rigorous formulation based on the recursive algorithm combined with the lattice sums technique. The proposed approach could be applied easily to the various configurations of the grating composed of the metal or metal-coated nanocylinders with different types and locations of the excitation sources. Special attention is paid to the three types of resonances: (a) surface plasmon resonances associated with the metal nanocylinders, (b) Rayleigh anomalies related with the periodic nature of the grating, and (c) resonances due to the coupling between the grating and the dielectric substrate. Near-field distribution of the magnetic field, which is parallel to the axis of the nanocylinders, is investigated numerically. Physical insight is given to the localization of the field along the interfaces of the metal nanocylinders, formation of the strong reflected field by the grating, and the field enhancement at the surface of the dielectric substrate. The accuracy of the numerical analyses has been tested based on the principle of the energy conservation. All these features are technologically important and have wide practical application from the viewpoint of the flexible design and fabrication of the plasmonic optical devices.

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Refractive-index sensitivities of hybrid surface-plasmon resonances for a core-shell circular silver nanotube sensor

Cited by 64 publications

References 13 publications

THz wave scattering and absorption by a dielectric tube with a graphene cover

THz wave scattering and absorption by a dielectric tube with a graphene cover

Scattering of Light by the Metal-Coated Dielectric Nanocylinders With Angular Periodicity

Scattering of light by gratings of metal-coated circular nanocylinders on a dielectric substrate

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