Geometrical parameters controlled focusing and enhancing near field in infinite circular metal-dielectric multilayered cylinder

Gao, Shaoyan; Li, Pengbo; Li, Fuli

doi:10.1063/1.4798662

Cited by 13 publications

(8 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The gross features of the results are similar for the classical, quantum and QCM descriptions of the system. These results resemble those reported in the literature for similar core-shell systems [67][68][69][70][71][72][73]76]. With an increasing value of the core radius, R 1 (smaller S), the interaction between the induced charges across the gap increases, and the pair of hybridized plasmons with shell character display a red-shift (ω − − ), and a blue-shift (ω + c ), respectively.…”

Section: Role Of Quantum Tunneling Across the Gapsupporting

confidence: 88%

“…nanostructures are of considerable practical and fundamental interest. The optical properties of NMs have been addressed within the classical electromagnetic theory framework in a number of publications [67][68][69][70][71][72][73][74][75]. It is only recently that the full quantum results have been reported for the spherical NM [76] showing the importance of tunneling between the core and the shell.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantum effects in the optical response of extended plasmonic gaps: validation of the quantum corrected model in core-shell nanomatryushkas

et al. 2015

View full text Add to dashboard Cite

Electron tunneling through narrow gaps between metal nanoparticles can strongly affect the plasmonic response of the hybrid nanostructure. Although quantum mechanical in nature, this effect can be properly taken into account within a classical framework of Maxwell equations using the so-called Quantum Corrected Model (QCM). We extend previous studies on spherical cluster and cylindrical nanowire dimers where the tunneling current occurs in the extremely localized gap regions, and perform quantum mechanical time dependent density functional theory (TDDFT) calculations of the plasmonic response of cylindrical core-shell nanoparticles (nanomatryushkas). In this axially symmetric situation, the tunneling region extends over the entire gap between the metal core and the metallic shell. For core-shell separations below 0.5 nm, the standard classical calculations fail to describe the plasmonic response of the cylindrical nanomatryushka, while the QCM can reproduce the quantum results. Using the QCM we also retrieve the quantum results for the absorption cross section of the spherical nanomatryushka calculated by V. Kulkarni et al. [Nano Lett. 13, 5873 (2013)]. The comparison between the model and the full quantum calculations establishes the applicability of the QCM for a wider range of geometries that hold tunneling gaps.

show abstract

Section: Role Of Quantum Tunneling Across the Gapsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Quantum effects in the optical response of extended plasmonic gaps: validation of the quantum corrected model in core-shell nanomatryushkas

et al. 2015

View full text Add to dashboard Cite

show abstract

“…3(a)-3(c), and its intensity also reduces rapidly. [17] ω + − mode shows a little blue-shift, and its intensity enhances firstly and then reduces. The physical mechanism could be attributed to plasmon hybridization, the coupling of outer nan-otube is affected by the ratio of r 2 /r 3 .…”

Section: The Effect Of Inner Nanowire Radius With Different Middle Di...mentioning

confidence: 99%

“…[16] Gao et al have investigated the geometrical parameters focusing and enhancing near field in infinite circular silver-dielectric-silver cylinder with quasi-static approach, what is more, the study shows that local electric field enhancement provides the potential applications for optical data storage. [17] A stronger local field enhancement can be obtained in the middle dielectric wall between inner silver and outer tube at the resonance wavelength. [18] Moradi has theoretically studied how the plasmon excitations of the system depend on the dielectric difference between the core and shell in coated metallic nanowires.…”

Section: Introductionmentioning

confidence: 99%

Optical absorption tunability and local electric field distribution of gold-dielectric-silver three-layered cylindrical nanotube*

Ma¹,

Wu²,

Jiang³

et al. 2021

Chinese Phys. B

View full text Add to dashboard Cite

The effects of inner nanowire radius, shell thickness, the dielectric functions of middle layer and surrounding medium on localized surface plasmon resonance (LSPR) of gold-dielectric-silver nanotube are studied based on the quasi-staticapproximation. Theoretical calculation results show that LSPR of gold-dielectric-silver nanotube and LSPR numbers can bewell optimized by adjusting its geometrical parameters. The longer wavelength of | ω − − 〉 mode takes place a distinct red-shift with increasing the inner nanowire radius and the thickness of middle dielectric layer,while a blue-shift with increasing outer nanotube thickness. The physical mechanisms are explained based on the plasmon hybridization theory, induced charges and phase retardation. In addition, the effects of middle dielectric function and surrounding medium on LSPR, and the local electric field factor are also reported. Our study provides the potential appications of gold-dielectric-silver nanotube in biological tissues, sensor and related regions.

show abstract

“…However, this nonbonding mode can either be completely turned-off or significantly enhanced when the composition of Au/SiO 2 /Au nanostructure is altered by either substituting the inner core or outer shell with Ag, respectively. 30 In addition to composition, these hybridized LSPRs can also be tuned by changing the morphology of concentric nanostructure to nonspherical geometries 31,32,39,40 or by breaking the symmetry of the nanostructure, essentially allowing optically dark modes to couple with bright modes and generate unique optical resonances. 28,41,42 When bright plasmon modes, which are spectrally broad due to radiative damping, couple with spectrally narrow dark modes, this spectral interference gives rise to a characteristic asymmetric line shape described as a Fano resonance.…”

Section: ■ Introductionmentioning

confidence: 99%

Directional Scattering and Sensing with Bimetallic Fanocubes: A Complex Fano-Resonant Plasmonic Nanostructure

Erwin

Bardhan

2016

J. Phys. Chem. C

View full text Add to dashboard Cite

Concentric nanostructures provide a unique architecture to manipulate light by modification of their internal geometry with minimal changes to their overall size. In this work, we have theoretically examined, using finite difference time domain simulations, the plasmonic properties of a concentric cubic nanostructure consisting of a silver (Ag) core, silica (SiO2) interlayer, and gold (Au) shell. These “bimetallic fanocubes” display two separate geometry dependent Fano resonances in the visible and in the near-infrared. We employed a plasmon hybridization model to understand the origin of the spectral features and observe distinct hybridized modes contributed by the edges and corners, which is unique to the cubic geometry. Specifically, we note that the “nonbonding” mode that is essentially dark and not observable in spherical concentric nanostructures is enhanced in the bimetallic fanocubes. We show the far-field properties, and Fano resonances of the fanocubes can be tuned by altering the thickness of the silica layer, the thickness of the Au shell, and by breaking symmetry. Further, we have examined the refractive index sensing and directional scattering abilities of the fanocubes to ultimately enable their use in a range of applications, harnessing their absorption and scattering properties.

show abstract

Geometrical parameters controlled focusing and enhancing near field in infinite circular metal-dielectric multilayered cylinder

Cited by 13 publications

References 34 publications

Quantum effects in the optical response of extended plasmonic gaps: validation of the quantum corrected model in core-shell nanomatryushkas

Quantum effects in the optical response of extended plasmonic gaps: validation of the quantum corrected model in core-shell nanomatryushkas

Optical absorption tunability and local electric field distribution of gold-dielectric-silver three-layered cylindrical nanotube*

Directional Scattering and Sensing with Bimetallic Fanocubes: A Complex Fano-Resonant Plasmonic Nanostructure

Contact Info

Product

Resources

About