Surface plasma oscillations in bubble

Natta, M.

doi:10.1016/0038-1098(69)90770-4

Cited by 31 publications

(4 citation statements)

References 3 publications

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“…The response of the metal in which the void is located was modelled by the free-electron gas described by a semiclassic approach. In the present model the eigenfrequencies of the surface plasmon modes are in agreement with the prediction of surface-charge-density oscillations associated with a spherical cavity in a metallic medium which has been made by Natta [11]:…”

Section: Discussionsupporting

confidence: 88%

“…for clusters, in agreement with Mie [10], and h m 1 /m −1 = hω p + 1 2 + 1 for cavities, in agreement with Natta [11]. Experimentally [12], the optical spectra of small isolated sodium clusters are dominated by the dipole resonance of the surface collective mode of the sodium valence electrons, and the resonance frequency shifts from 2.4 eV to near the bulk value of ω p / √ 3 = 3.4 eV as cluster size increases.…”

Section: Polynomial Approximationsupporting

confidence: 86%

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Surface modes in metal clusters and cavities

Providência

1997

J. Phys.: Condens. Matter

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Solving the hydrodynamical equations by means of a variational principle, we obtain a simultaneous description of the surface and volume modes of the valence electrons in a metal. This variational scheme, which has been previously used in the context of nuclear fluid dynamics, is applied to describe the dynamics of the valence electrons in a spherical metal cluster and of the valence electrons in the metal surrounding a spherical cavity (void). The eigenmodes fulfil the linear energy-weighted sum rule , the inverse energy-weighted sum rule and orthogonality relations. The surface modes predicted by Mie (in clusters) and by Natta (in cavities) appear in this model as natural solutions of the equations of motion and boundary conditions. We have considered a stabilized spherical jellium model. The parameters of the effective interaction are obtained by means of a variational method taking into account the experimental values of the density, compressibility and bulk energy. In the present model we have ignored the diffuseness of the equilibrium electron density, taking into account, however, the surface degrees of freedom of the valence electrons and thus allowing them to penetrate into the vacuum (outside of the jellium) when undergoing collective oscillations. The spectra of the excitation energies, and the electronic transition currents and transition densities are obtained for spherical clusters and voids.

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Section: Discussionsupporting

confidence: 88%

Section: Polynomial Approximationsupporting

confidence: 86%

Surface modes in metal clusters and cavities

Providência

1997

J. Phys.: Condens. Matter

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“…On Figure 2b, the bulk plasmon can be seen at about 22.6 eV. An additional peak around 14 eV, attributed to the cavity plasmon, 28,43 is also observed when the probe is located across the pore. An additional broad feature can be observed between 15 and 19 eV, which can be tentatively attributed to surface states of the SiO x N y matrix.…”

Section: Resultsmentioning

confidence: 92%

Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

2016

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Nanoporous silicon based materials with closed porosity filled with the sputtering gas have been recently developed by magnetron sputtering. In this work the physical properties (density and pressure) of molecular nitrogen inside closed pores in a SiO x N y coating are investigated for the first time using spatially resolved electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope. The paper offers a detailed methodology to record and process multiple EELS spectrum images (SIs) acquired at different energy ranges and with different dwell times. It is demonstrated an adequate extraction and quantification of the N-K edge contribution due to the molecular nitrogen inside nanopores. Core-loss intensity and N chemical bond state were evaluated to retrieve 2D maps revealing stable high density of molecular nitrogen (from 40 to 70 at./nm 3 ) in nanopores of different size (20 to 11 nm). This work provides new insights on the quantification of molecular N 2 trapped in porous nitride matrices that could be also applied to other systems.

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“…They may be excited either at metallic clusters in a dielectric matrix (Mie resonances [4]) or at pores in a metal-like medium (Natta plasma oscillations [5]). Previously, it has been reported that fluorescence from organic molecules coated by indium is increased by a factor of 30 [6].…”

mentioning

confidence: 99%

Localized plasmons at pores and clusters within inhomogeneous indium nitride films

Shubina

Vasson²,

Leymarie³

et al. 2007

Phys. Status Solidi (c)

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We report on reproducibly observed enhancement of luminescence within inhomogeneous InN films near both In clusters and pores. Low-temperature absorption in these films deviates from that expected for a conventional semiconductor. The enhancement of emission is discussed in terms of coupling of excited radiative states with localized particle plasmons. It implies concentration of an electric field near the pores and clusters, which are considered, respectively, as metallic and dielectric ellipsoids within a semiconductor matrix.1 Introduction It has been known for a long time that optical properties of a radiating dipole are changed in the vicinity of a metal surface [1]. This effect arises due to excitation of surface plasmons at a metal interface and coupling of them with the radiator. Currently, this phenomenon attracts a considerable attention in the context of light enhancement in structures with many of defects. For instance, it is realized for a InGaN quantum well covered by a metal film, what can be useful for efficient light emitting diodes [2]. Generally, this effect is similar to an increase of spontaneous emission probability in a resonator cavity considered by Purcell [3]. The plasmon excitation concentrates the electromagnetic energy that enhances the density of possible photon states. In accordance with the golden rule, this increases the transition rate and, hence, the emission intensity. The coupled states are formed due to the proximity of the frequencies and the spatial closeness of the radiator and plasmonic excitation.

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Surface plasma oscillations in bubble

Cited by 31 publications

References 3 publications

Surface modes in metal clusters and cavities

Surface modes in metal clusters and cavities

Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

Localized plasmons at pores and clusters within inhomogeneous indium nitride films

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Surface plasma oscillations in bubble

Cited by 31 publications

References 3 publications

Surface modes in metal clusters and cavities

Surface modes in metal clusters and cavities

Nitrogen Nanobubbles in a-SiOxNy Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

Localized plasmons at pores and clusters within inhomogeneous indium nitride films

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Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy