Subwavelength core/shell cylindrical nanostructures for novel plasmonic and metamaterial devices

Kim, Kyoung‐Ho; No, You-Shin

doi:10.1186/s40580-017-0128-8

Cited by 26 publications

(8 citation statements)

References 65 publications

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“…w h e r e a s the coefficients n a and n b for a core-shell nanowire can be found in [23,26,27]. In this calculation, the wavelength dependent complex refractive indices for Ag were obtained from [28], and the corresponding data for TiO2 was taken from [29].…”

Section: Methodsmentioning

confidence: 99%

Optical properties of TiO<sub>2</sub>@Ag nanowires and nanospheres

Dasri¹,

Chaiyachate

Audtarat³

et al. 2020

J Met Mater Miner

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Nanoparticles (NPs) with nonmetallic cores and metallic shells (such as Au, Ag, and Cu) can exhibit improve absorption efï¬ciency due to localized surface plasmon resonance (LSPR), charge density oscillations at the surfaces of these core-shell composite nanoparticles. In this study, the effect of the geometry of TiO2@Ag core-shell composite nanoparticles on their optical absorption properties was theoretically illustrated in the wavelength ranges between the visible and infrared light regions of electromagnetic radiation. These nanostructures were modeled by varying the TiO2 core and Ag shell radii of the composite nanospheres and nanowires. The results indicate that varying the TiO2 core radius and Ag shell thickness can be used to tune the absorption efï¬ciency of these materials from the UV region to the visible or infrared regions of the electromagnetic spectrum. An increase in the absorption efï¬ciency with greater core radii was observed. The absorption efficiency peaks of core-shell nanospheres or nanowires increased with the shell radius. Theoretical modeling based on these results suggest that this nanomaterial can be effectively utilized so that its optical absorption properties can be tuned. These properties could help to synthesize TiO2@Ag core-shell composite NPs for use in environmental applications such as treating contaminated water and in novel future devices.

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Section: Methodsmentioning

confidence: 99%

Optical properties of TiO<sub>2</sub>@Ag nanowires and nanospheres

Dasri¹,

Chaiyachate

Audtarat³

et al. 2020

J Met Mater Miner

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“…Shiva Hayati Raad 1 Strong tunable absorption using a graphene-coated spherical resonator with fixed dielectric core refractive index of n and silver shell thickness of t [15].…”

Section: Author Detailsmentioning

confidence: 99%

“…For instance, a metal-core dielectric-shell nano-wire has been proposed for the cloaking applications in the visible spectrum. The functionality of this structure is based on the induction of antiparallel currents in the core and shell regions, and the design procedure is the so-called scattering cancelation technique [1]. Experimental realization of a hybrid gold/silicon nanowire photodetector proves the practicality of these structures [2].…”

Section: Introductionmentioning

confidence: 99%

Scattering from Multilayered Graphene-Based Cylindrical and Spherical Particles

Raad¹,

Atlasbaf²,

Cuevas³

2020

Nanoplasmonics

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This chapter discusses various approaches for calculating the modified Mie-Lorenz coefficients of the graphene-based multilayered cylindrical and spherical geometries. Initially, the Kubo model of graphene surface conductivity is discussed. Then, according to it, the formulations of scattering from graphene-based conformal particles are extracted. So, we have considered a graphene-wrapped cylinder and obtained its scattering coefficients by considering graphene surface currents on the shell. Later, a layered nanotube with multiple stacked graphene-dielectric interfaces is introduced, and for analyzing the plane wave scattering, graphene surface conductivity is incorporated in the transfer matrix method (TMM). Unlike the previous section, the dielectric model of graphene material is utilized, and the boundary conditions are applied on an arbitrary graphene interface, and a matrix-based formulation is concluded. Then, various examples ranging from super-scattering to super-cloaking are considered. For the scattering analysis of the multilayered spherical geometries, recurrence relations are introduced for the corresponding modified Mie-Lorenz coefficients by applying the boundary conditions at the interface of two adjacent layers. Later, for a sub-wavelength nanoparticle with spherical morphology, the full electrodynamics response is simplified in the electrostatic regime, and an equivalent circuit is proposed. Various practical examples are included to clarify the importance of scattering analysis for graphene-based layered spheres in order to prove their importance for developing novel optoelectronic devices.

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“…Metamaterials are artificial materials composed of nanometer-sized hybrid metal-dielectric nanostructures which can attain unique electromagnetic (EM) characteristics that cannot be found naturally [ 1 , 2 , 3 ]. Plasmonic metamaterials can be used to trap the EM wave in the nanometer regime and beyond the diffraction limit of traditional optics [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Visible-Range Multiple-Channel Metal-Shell Rod-Shaped Narrowband Plasmonic Metamaterial Absorber for Refractive Index and Temperature Sensing

et al. 2023

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Multiple resonance modes in an optical absorber are necessary for nanophotonic devices and encounter a challenge in the visible range. This article designs a multiple-channel plasmonic metamaterial absorber (PMA) that comprises a hexagonal arrangement of metal-shell nanorods in a unit cell over a continuous thin metal layer, operating in the visible range of the sensitive refractive index (RI) and temperature applications. Finite element method simulations are utilized to investigate the physical natures, such as the absorptance spectrum, magnetic flux and surface charge densities, electric field intensity, and electromagnetic power loss density. The advantage of the proposed PMA is that it can tune either three or five absorptance channels with a narrowband in the visible range. The recorded sensitivity and figure of merit (S, FOM) for modes 1–5 can be obtained (600.00 nm/RIU, 120.00), (600.00 nm/RIU, 120.00 RIU−1), (600.00 nm/RIU, 120.00 RIU−1), (400.00 nm/RIU, 50.00 RIU−1), and (350.00 nm/RIU, 25.00 RIU−1), respectively. Additionally, the temperature sensitivity can simultaneously reach 0.22 nm/°C for modes 1–3. The designed PMA can be suitable for RI and temperature sensing in the visible range.

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Subwavelength core/shell cylindrical nanostructures for novel plasmonic and metamaterial devices

Cited by 26 publications

References 65 publications

Optical properties of TiO<sub>2</sub>@Ag nanowires and nanospheres

Optical properties of TiO<sub>2</sub>@Ag nanowires and nanospheres

Scattering from Multilayered Graphene-Based Cylindrical and Spherical Particles

Visible-Range Multiple-Channel Metal-Shell Rod-Shaped Narrowband Plasmonic Metamaterial Absorber for Refractive Index and Temperature Sensing

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