Visualization of Multipolar Longitudinal and Transversal Surface Plasmon Modes in Nanowire Dimers

Alber, I.; Sigle, Wilfried; Müller, Sven; Neumann, R.; Picht, O.; Rauber, Markus; Aken, Peter A. van; Toimil-Molares, María Eugenia

doi:10.1021/nn2035044

Cited by 83 publications

(106 citation statements)

References 47 publications

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“…Longitudinal plasmon redshifts and transverse plasmon blueshifts and the apparition of higher longitudinal plasmon modes when the nanoparticle sizes and aspect ratios increase have already been predicted [126] and experimentally demonstrated in the literature [46][47][48]. Figures 7 and 8 demonstrate that the longitudinal resonance frequencies of the Au nanoparticles in a silica matrix are tunable to a high degree by adjusting their lengths and diameters.…”

Section: Experimental and Analytical Plasmonic Dispersion Relationsupporting

confidence: 63%

Localized Plasmonic Resonances of Prolate Nanoparticles in a Symmetric Environment: Experimental Verification of the Accuracy of Numerical and Analytical Models

et al. 2018

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We study the evolution of the surface-plasmon resonances of individual ion-beam-shaped prolate gold nanoparticles embedded in a dielectric SiO 2 environment by electron-energy-loss spectroscopy mapping in a scanning transmission electron microscope. The controlled symmetric dielectric environment obtained through the ion-beam-shaping method allows a direct quantitative comparison with numerical results obtained through simulations (auxiliary differential-equation finite-difference time-domain and boundary-element method) and with theoretical results obtained through analytical models (quasistatic model for prolate nanoellipsoids and waveguide model for infinite one-dimensional plasmonic waveguides), with which our experimental results are in very good agreement. We confirm the accuracy of state-of-the-art numerical tools and analytical theories that establish ion-beam shaping as a very promising method to design metal-dielectric nanocomposites with well-predicted optical properties, and with many possible applications in surfaceenhanced Raman spectroscopy and second-harmonic generation, as well as in conventional applications of metamaterials like negative refraction, superimaging, and invisibility cloaking.

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Section: Experimental and Analytical Plasmonic Dispersion Relationsupporting

confidence: 63%

Localized Plasmonic Resonances of Prolate Nanoparticles in a Symmetric Environment: Experimental Verification of the Accuracy of Numerical and Analytical Models

et al. 2018

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“…It was also demonstrated that energy-filtered transmission electron microscopy (EFTEM) can be equivalently employed to obtain the same information [8]. Plasmons in nanoparticles of other geometries were also visualized with SI methods [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. In particular, to investigate SERS activity, Guiton et al employed STEM-EELS to probe the fields of plasmons in silver nanorods and correlated this with far-field scattering spectroscopy [15].…”

Section: Introductionmentioning

confidence: 99%

Photon-induced near-field electron microscopy: Mathematical formulation of the relation between the experimental observables and the optically driven charge density of nanoparticles

Park

Zewail

2014

Phys. Rev. A

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Photon-induced near-field electron microscopy (PINEM) enables the visualization of the plasmon fields of nanoparticles via measurement of photon-electron interaction [S. T. Park et al., New J. Phys. 12, 123028 (2010)]. In this paper, the field integral, which is a mechanical work performed on a fast electron by the total electric field, plays a key role in understanding the interaction. Here, we reexamine the field integral and give the physical meaning by decomposing the contribution of the field from the charge-density distribution. It is found that the "near-field integral" (the near-field approximation of the field integral) can be expressed as a convolution of the two-dimensional projection of the optically driven charge-density distribution in the nanoparticle with a broad radial response function. This approach, which we call the "convolution method," is validated by applying it to Rayleigh scattering cases, where previous analytical expressions for the field integrals in near-field approximations are reproduced by the convolution method. The convolution method is applied to discrete dipole approximation calculations of a silver nanorod, and the nature of the induced charge-density distributions of its plasmons is discussed.

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“…Therefore, a number of different dimer geometries, such as sphere dimer [17], triangular dimer [18], nanoshell dimer [19], and nanowire dimer [20], were carried out experimentally and theoretically. However, the performance of a nanoparticle dimer with gain material is still inexplicit to our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Effect of a Nanoshell Dimer with Different Gain Materials

et al. 2014

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Though the plasmonic property for a passive nanoparticle dimer has been studied widely, the performance of a nanoparticle dimer with gain material is still inexplicit to our knowledge. Therefore, in this paper, we focus on the plasmonic effect of a nanoshell dimer, with its core filled with different gain materials, under a polarized plane wave excitation using a three-dimensional finite difference time domain method. It is shown that the gain materials in the core of the nanoshell can compensate the intrinsic absorption of the metal shell, resulting in a local energy enhancement in the junction of the active nanoshell dimer. The physics is supported by the detailed energy distribution of the active nanoshell dimer in each geometry region. It is found that the plasmonic coupling between two active nanoshell particles is more compact than the case of passive ones. The influence of shell thickness on the interaction between two adjacent active nanoshells is also analyzed.

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Visualization of Multipolar Longitudinal and Transversal Surface Plasmon Modes in Nanowire Dimers

Cited by 83 publications

References 47 publications

Localized Plasmonic Resonances of Prolate Nanoparticles in a Symmetric Environment: Experimental Verification of the Accuracy of Numerical and Analytical Models

Localized Plasmonic Resonances of Prolate Nanoparticles in a Symmetric Environment: Experimental Verification of the Accuracy of Numerical and Analytical Models

Photon-induced near-field electron microscopy: Mathematical formulation of the relation between the experimental observables and the optically driven charge density of nanoparticles

Plasmonic Effect of a Nanoshell Dimer with Different Gain Materials

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