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  • 1
    Electronic Resource
    Electronic Resource
    Resonant Raman scattering by breathing modes of metal nanoparticles (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 3444-3447 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Low-frequency Raman scattering experiments have been performed on metal nanoparticles embedded in two different thermally treated matrices. In addition to the well-known Raman scattering by the nanoparticle quadrupolar vibrational mode, the spectra measured in the 3–40 cm−1 frequency range exhibit several new bands. They are ascribed to resonant scattering by the nanoparticle breathing mode and its harmonics, in very good agreement with time-resolved measurements. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1396817
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  • 2
    Electronic Resource
    Electronic Resource
    Optical Properties of Sputtered Silver Granular Films (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 480-481 (Mar. 2005), p. 287-292 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this research we study optical absorption and morphology of silver films prepared with a sputtering method. Silver granular films are obtained on a glass substrate for films with thickness smaller than about 60 Å. Superficial silver clusters of around 100 nm in diameter are clearly seen in the atomic force micrographs. The absorption of these samples are characterized by plasmon excitation in the 450-650 nm spectral range, which differs from the known excitation of silver nanoparticles fabricated by different techniques. The optical absorption of silver granular filmsdepend on sputtering conditions like substrate temperature or deposition rate and correlates with the surface morphology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.480-481.287.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Very fast relaxation in polycarbonate glass (2000)
    Springer
    The European physical journal 17 (2000), S. 661-666 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.41.+e Polymers, elastomers, and plastics - 61.12.Ex Neutron scattering techniques (including small-angle scattering) - 64.70.Pf Glass transitions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Relaxations in amorphous bis-phenol A polycarbonate are studied by neutron scattering, as a function of temperature below the glass transition. Two different processes are observed. One is very fast, with a characteristic time (∼ 0.3 ps), that is independent of temperature and momentum transfer. Conversely the other is slower, with a time which is dependent on temperature and momentum transfer. The very fast localized anharmonic motion is interpreted by the overdamping of low-frequency vibrational modes, by nearby dynamic holes. The slower relaxation is thermally activated and momentum transfer dependent. It corresponds to molecular group motions and possibly to the short-time regime of the segmental relaxation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070105
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  • 4
    Electronic Resource
    Electronic Resource
    Origin of the resonant optical Kerr nonlinearity in Cd(S, Se)-doped glasses and related topics (1995)
    Springer
    Applied physics 61 (1995), S. 17-26 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 42.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract After having reported preliminary results related to saturation, we first theoretically consider the various mechanisms contributing to the resonant optical Kerr effect in Cd(S, Se)-doped glasses. We obtain the expression for the expected effective susceptibility in different possible cases. This nonlinearity is studied experimentally using optical-phase conjugation in the low-intensity regime. We show that, by time resolving the nonlinear response of such glasses having experienced various degrees of photodarkening, we can clearly assess the origin of the resonant optical Kerr effect in these materials. Usually, a combination of a fast free-carrier contribution due to particles without traps and of a slow trapped-carrier one due to particles with traps is observed. For the free-carrier contribution, induced absorption is observed to be almost as important as absorption saturation. We also report frequency-dependent measurements and discuss the change in absorption spectrum and the increase of the nonradiative decay rate that accompany darkening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01090967
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  • 5
    Electronic Resource
    Electronic Resource
    Plasmon-phonon coupling and resonant raman scattering of silver clusters (1999)
    Springer
    The European physical journal 9 (1999), S. 585-589 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 36.20.Ng Vibrational and rotational structure, infrared and Raman spectra – 63.20.Pw Localized modes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Absorption and low-frequency Raman scattering experiments have been performed on thin films consisting of small silver clusters embedded in a porous alumina matrix. When the Raman excitation wavelength is close to the maximum (≈420 nm) of the Mie band (dipolar surface plasmon resonance) the Raman spectra exhibit a strong band located around 10 cm-1, the maximum of which depends on the mean cluster diameter 〈D〉 in the sample according to the approximate law ωvib∝〈D〉-1. The Raman band corresponds to the excitation of the quadrupolar vibration mode of the clusters. Moreover, the maximum of the Raman band shifts towards lower frequencies when the excitation light is shifted to the red. This feature, as well as the rather large Mie-band width, is thought to reflect the ellipsoidal shape distribution of part of the embedded clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050505
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