Coupled interface plasmons of the Ag-Si(111) system as investigated with high-resolution electron energy-loss spectroscopy

Layet, J. M.; Contini, R.; Derrien, J.; Lüth, H.

doi:10.1016/0039-6028(86)90844-7

Cited by 29 publications

(8 citation statements)

References 13 publications

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“…On the other hand, for 20 ML Ag/ Si(111) (data from [2]) interface plasmons at 1.0 and 2.7 eV have been observed, in agreement with measurements in [54]. The peak at 500 meV in Ag films on metal surfaces could be thus assigned to an interface plasmon or to an interband transition.…”

Section: Resultssupporting

confidence: 78%

Interplay of structural and temperature effects on plasmonic excitations at noble-metal interfaces

Politano

2012

Philosophical Magazine

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The interplay of structural and electronic properties on plasmon modes was investigated for a thin Ag film grown at room temperature on Cu(111). Surface plasmons are confined within Ag grains, as indicated by the analysis of their dispersion relationship, which is dispersionless up to a critical wave-vector. Surface plasmon confinement is removed upon annealing at 400 K. The thermal treatment induces a flattening of the Ag adlayer with a merging of Ag islands, and, moreover, a strong enhancement of surface conductivity.

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Section: Resultssupporting

confidence: 78%

Interplay of structural and temperature effects on plasmonic excitations at noble-metal interfaces

Politano

2012

Philosophical Magazine

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“…In addition, a study on the Ag/Si system has shown that 2D Ag clusters will not give the surface plasmon. 23 Moreover, another study indicates that the surface plasmon is excited only after the condensed phase in the second monolayer has started to form. 24 This means that there must be 3D layers/clusters formed if surface plasmon is detected.…”

Section: Gold Growth On Tio 2 (110)mentioning

confidence: 99%

Initial growth of Au on oxides

Guo

Luo

Davis

et al. 2001

Surface & Interface Analysis

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The growth of Au clusters on TiO 2 .110/ − .1 × 1/ and −.1 × 2/ single-crystal surfaces and on ordered Al 2 O 3 films prepared on Re(0001) has been studied by low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), low-energy ion scattering spectroscopy (LEISS) and high-resolution electron energy-loss spectroscopy (HREELS). The results indicate that Au forms two-dimensional islands on the TiO 2 (110) surface at initial deposition of Au. On the alumina film, Au initially grows as three-dimensional clusters. The coverage of Au at which Au clusters change from non-metallic to metallic properties is found to be >0.3 monolayer equivalent (MLE) of Au deposition based on the energy shift of the surface plasmon measurements.

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“…In contrast, the Ag MP has been recently measured in Ag films on Ni(111). However, such excitation is revealed only in experimental conditions enhancing the surface sensitivity, i.e., at low impinging energies and grazing incidence (Politano et al, 2013b,d), in agreement with Liebsch's prediction (Liebsch, 1998). Therefore, electron quantum confinement in Ag 5 sp-derived QWS (Miller et al, 1994) enhances the cross section for Ag MP excitation in thin films compared with semi-infinite media (bulk samples).…”

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confidence: 52%

“…The presence of QWS and the subsequent enhanced SP density of states around the Fermi level in thin films may also increase the cross section for the excitation of intrinsically free-electron plasmons, such as the multipole surface plasmon (MP) (Liebsch, 1998). The nature of MP has been understood for alkali metals (Tsuei et al, 1990(Tsuei et al, , 1991Sprunger et al, 1992;Zielasek et al, 2006), alkaline-earth metals (Sprunger et al, 1992), and aluminum (Chiarello et al, 2000).…”

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confidence: 99%

“…Unfortunately, contradictory results are reported for the most popular plasmonic systems (Ag and Au). Calculations based on a s-d polarization model by Liebsch (1998) predicted the existence of the Ag and Au MP near ω m = 0.8 · ω p = 7.2 eV (ω p = 9.0 eV is the s-electron bulk plasmon energy for both Ag and Au) as the density profile at the surface has predominantly s-electron character. Experiments on bulk Ag have not found this mode (Moresco et al, 1996;Barman et al, 2004a,b).…”

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confidence: 99%

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Plasmonic Modes in Thin Films: Quo Vadis?

Politano

Chiarello

2014

Front. Mater.

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Herein, we discuss the status and the prospect of plasmonic modes in thin films. Plasmons are collective longitudinal modes of charge fluctuation in metal samples excited by an external electric field. Surface plasmons (SPs) are waves that propagate along the surface of a conductor with applications in magneto-optic data storage, optics, microscopy, and catalysis. In thin films, the electronic response is influenced by electron quantum confinement. Confined electrons modify the dynamical screening processes at the film/substrate interface by introducing novel properties with potential applications and, moreover, they affect both the dispersion relation of SP frequency and the damping processes of the SP. Recent calculations indicate the emergence of acoustic surface plasmons (ASPs) in Ag thin films exhibiting quantum well states and in graphene films. The slope of the dispersion of ASP decreases with film thickness. We also discuss open issues in research on plasmonic modes in graphene/metal interfaces.

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Coupled interface plasmons of the Ag-Si(111) system as investigated with high-resolution electron energy-loss spectroscopy

Cited by 29 publications

References 13 publications

Interplay of structural and temperature effects on plasmonic excitations at noble-metal interfaces

Interplay of structural and temperature effects on plasmonic excitations at noble-metal interfaces

Initial growth of Au on oxides

Plasmonic Modes in Thin Films: Quo Vadis?

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