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  • Electronic Resource  (11)
  • 36.40  (5)
  • 41.70  (3)
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  • Electronic Resource  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    The optical kerr effect in small metal particles and metal colloids: The case of gold (1988)
    Springer
    Applied physics 47 (1988), S. 347-357 
    Details
    ISSN: 1432-0630
    Keywords: 42.65 ; 78.20 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We first consider theoretically the various mechanisms contributing to the Kerr nonlinearity in small gold particles. The major ones are the conduction electron intraband contribution, the saturation of direct interband transitions and the change in dielectric constant due to hot photoexcited electrons. We present experimental results obtained using optical phase conjugation in gold-doped glasses. By varying several parameters, we were able to ascertain the origin of the nonlinear response: the main contributions are the hotelectron and the interband contributions. All experimental results, including saturation behaviour, are fully understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615498
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The optical kerr effect in small metal particles and metal colloids: The case of gold (1988)
    Springer
    Applied physics 47 (1988), S. 347-357 
    Details
    ISSN: 1432-0630
    Keywords: 42.65 ; 78.20 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We first consider theoretically the various mechanisms contributing to the Kerr nonlinearity in small gold particles. The major ones are the conduction electron intraband contribution, the saturation of direct interband transitions and the change in dielectric constant due to hot photoexcited electrons. We present experimental results obtained using optical phase conjugation in gold-doped glasses. By varying several parameters, we were able to ascertain the origin of the nonlinear response: the main contributions are the hotelectron and the interband contributions. All experimental results, including saturation behaviour, are fully understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615498
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Electronic excitations in many-particle systems: a quantitative analysis (1989)
    Springer
    The European physical journal 12 (1989), S. 521-525 
    Details
    ISSN: 1434-6079
    Keywords: 41.70 ; 78.40 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Small particles, produced in usual experiments, commonly form many-particle systems. Interactions of various kinds among the particles influence the properties of such systems. We consider here the optical properties of noble metal particle systems with separated nearly spherical particles and with aggregates formed by induced coagulation of the single particles. In order to describe their optical extinction we apply electrodynamic interaction models on particles and aggregates. We perform a quantitative analysis of the extinction spectrum of one selected sample with the electrodynamic interaction model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427010
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Systems of small metal particles: Optical properties and their structure dependences (1986)
    Springer
    The European physical journal 3 (1986), S. 239-249 
    Details
    ISSN: 1434-6079
    Keywords: 71.45 ; 78.20 ; 81.20 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experiments on small particles usually require samples containing large numbers of particles. The properties of such samples are determined both by the properties of the individual particle and by collective effects, if particles are packed closely together. Collective optical effects strongly depend on the topography of the samples. It is shown that they can be classified according to the effective local electromagnetic field. Recent experiments and calculations are presented for optical extinction spectra in the spectral region of plasmon polariton excitations, which clearly show the different behaviour of effective medium-like samples and of samples containing particle aggregates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384813
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  • 5
    Electronic Resource
    Electronic Resource
    The optical extinction of ligand-stabilized Au13- and Au55-clusters: The vanishing of the Mie-resonance (1993)
    Springer
    The European physical journal 26 (1993), S. 1-3 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 33.20K
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present optical extinction spectra of ligand-stabilized Au-clusters AuN with sizes of N=13 and N=55. They are compared to larger, embedded clusters up to N=5·103 (diameter 5nm). The Mie resonance due to excitation of the dipole plasmon polariton vanishes with decreasing cluster size. For N〉55, this effect has recently been interpreted as caused by smearing out of the interband transition edge of Au.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425599
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  • 6
    Electronic Resource
    Electronic Resource
    Optical properties of systems containing Au55-clusters (1989)
    Springer
    The European physical journal 12 (1989), S. 515-520 
    Details
    ISSN: 1434-6079
    Keywords: 33.20.K ; 36.40 ; 42.20 ; 78.40 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Gold cluster compounds were investigated which contain clusters of 55 gold atoms in each unit. The ligands stabilize these clusters and, hence, many-cluster systems can be prepared which mainly show the properties of the single dressed cluster. Experimental results of optical and electron-microscopical investigations are presented and shortly discussed in view of the question whether the clusters are molecular or solid-state like.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427009
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Many-cluster-systems: models of inhomogeneous matter (1989)
    Springer
    The European physical journal 12 (1989), S. 505-514 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 42.20 ; 78.00 ; 81.20 ; 81.40 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract First, some general remarks concerning macroscopic “cluster matter” are given. In the second part, three recent, mainly optically and electron-microscopically performed investigations are discussed which deal with special properties of noble metal cluster systems forming the building units of this kind of matter:(1) dressed Au-55 clusters,(2) electromagnetic coupling effects among coagulated clusters,(3) the transition towards compact inhomogeneous matter caused by coalescence of clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427008
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Binary clusters: homogeneous alloys and nucleus-shell structures (1993)
    Springer
    The European physical journal 26 (1993), S. 242-245 
    Details
    ISSN: 1434-6079
    Keywords: 41.70 ; 61.55 ; 73.40 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Extinction spectra of Agx-Au(1−x)-alloy particles embedded in glass are compared to spectra of gold coated silver clusters and silver coated gold clusters. It is shown, that the optical extinction of alloy particles is described by the Mie theory applying the homogeneous dielectric function $$\hat \varepsilon $$ (ω,R, x) measured by Paquet. The absorption of core-shell clusters was calculated deriving an extension of the Mie theory to spheres with arbitrary numbers of shells of arbitrary materials. Comparison to measured spectra points to s-electron motion in the clusters with only slight scattering at the interior interface. The appearance of two distinct Mie peaks however proves the existence of the sharp Ag-Au interface. The extended Mie formalism was also applied to a multilayer system consisting of sodium and a dielectric substance as an example for a spherical hetero structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429157
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  • 9
    Electronic Resource
    Electronic Resource
    Optical extinction on free, supported and embedded metal clusters (1991)
    Springer
    The European physical journal 20 (1991), S. 301-304 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 + d ; 41.80 ; 41.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract To study changes of the optical properties of clusters due to interactions with matrices and substrates, clusters of several nm diameter were produced by the inert gas condensation and by the gas free expansion technique. Theoretical predictions for the cluster formation process could be verified. Optical extinction was measured on the free cluster beam, after deposition on quartz substrates and after embedding in quartz matrices. Several of the samples were analyzed by TEM. It is shown, that at high source temperatureT 0 the free clusters remain liquid on their way through the vacuum chamber but solidify there ifT 0 is decreased. At higherT 0 oblate ellipsoids are formed during the deposition. The spectra of the free beam deviate from theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543996
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  • 10
    Electronic Resource
    Electronic Resource
    Optical plasmon losses in stabilized Au55 clusters (1991)
    Springer
    The European physical journal 20 (1991), S. 297-300 
    Details
    ISSN: 1434-6079
    Keywords: 33.20.K ; 36.40 ; 42.20 ; 78.40 ; 82.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Au55 cluster compounds are investigated by optical spectroscopy and TEM. The optical spectra appear to be rather structureless, neither showing a collective excitation resonance nor exhibiting distinct absorption bands known from lower nuclearity clusters. We discuss changes of the electronic properties compared to larger Au clusters affecting both, 6sp electrons and5d-6sp interband transitions, the cluster-ligand-interaction being considered as a charge transfer process. We additionally report on a low temperature instability of the cluster compound, which results in changed optical extinction spectra. A characteristic absorption feature at λ=400 nm is attributed to small, ligand-free Au cluster fragments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543995
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    Paper (German National Licenses)
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