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  • 1
    Digitale Medien
    Digitale Medien
    Optical properties of nanoscale, one-dimensional silicon grating structures (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6997-7008 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report a detailed study of nanostructure fabrication and optical characterization of sub-μm-period, one-dimensional, Si grating structures. Nanoscale wall width structures were fabricated by combining laser interferometric lithography with anisotropic wet-chemical etching (KOH) and thermal oxidation. Structure wall widths were characterized by Raman scattering (RS) and scanning electron microscopy. Salient features of the RS measurements as a function of wall widths from ∼100 to 10 nm were: (a) large cross-section enhancements, ∼100×, for linewidths ∼50 nm; (b) asymmetric line shapes with tails extending to smaller Raman shifts for linewidths ∼20 nm; and (c) splitting of the bulk Raman mode, again to lower Raman shifts, for linewidths ∼10 nm. For room temperature photoluminescence (PL) measurements, the grating structures were excited at 257 nm. PL measurements are reported for oxidized and unoxidized grating structures with peaks varying between 380 and 700 nm. PL was only observed for Si structures with dimensions less than about 10 nm. PL intensities and spectral line shapes varied significantly as a result of surface modification treatments such as high temperature anneal in a N2 atmosphere, immersion in boiling H2O, and long-term exposure to ambient air. The measurements indicate a strong correlation of the visible PL with crystal size (∼5–10 nm); however, it remains unclear if the mechanism responsible is quantum confinement, passivation of the surface by Si:Hx complexes, or optically active surface states. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363774
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of thin Al films using grating coupling to surface plasma waves (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 6039-6048 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A detailed characterization of the optical, microstructural, and electrical properties of thin (5–50 nm) Al films grown by thermal evaporation, magnetron sputtering, and ion-assisted sputtering (IAS), is reported. Dielectric-function measurements were carried out by using grating coupling to surface plasma waves (SPW) and, for comparison, ellipsometric measurements were also performed. Scanning electron microscope (SEM) studies of film microstructure as well as dc electrical resistivity measurements were carried out and correlated with the optical data. Using the Bruggeman effective media approximation, good agreement was obtained for thicker films (30–50 nm), but not for thinner films (〈30 nm). SEM and resistivity measurements suggest that conditions of film growth influence the behavior of individual grains, resulting in increased electron reflectance at the grain boundaries with increasing energy delivered to the substrate during deposition. This resulted in lower electrical resistivities for evaporated films than for IAS films. Finally, the influence of 5–20 A(ring) Al2O3 on thick Al films was investigated: Both SPW and resistivity measurements suggest that the oxide film was not confined to film surface, but had penetrated inside the film leading to much higher electrical resistivities than would be otherwise expected.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350461
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  • 3
    Digitale Medien
    Digitale Medien
    Electromagnetic vortices in electron-positron-ion plasmas with shear flow (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 474-479 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Two coupled nonlinear equations for a perturbed electromagnetic field in an electron-positron-ion plasma with shear flow, embedded in a nonuniform magnetic field, are derived and solved analytically. The nonlinear solutions of these equations are found in the form of tripolar vortices. The linear instability condition is also discussed. It is found that the presence of ions can play a significant role in nonlinear dynamics, even if the density of ions is of the order of 10−3 as compared to the densities of the lighter species. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1436126
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  • 4
    Digitale Medien
    Digitale Medien
    Effects of ion streaming and propagation direction on ion-acoustic solitary waves (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 724-726 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: It is found that ion streaming and the direction of propagation of the nonlinear structure are the factors which can determine the amplitude of the density hump in fully nonlinear ion-acoustic solitary waves. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1433663
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  • 5
    Digitale Medien
    Digitale Medien
    Response to "Comment on ‘Role of quasineutrality in drift waves' " [Phys. Plasmas 8, 3519 (2001)] (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3522-3522 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: It is asserted that the Comment of Shukla et al. [Phys. Plasmas 8, 3519 (2001)] does not focus on errors or mistakes in the original paper. It reproduces several results already quoted in the literature. Some of these results are not consistent. In the original paper only a procedural flaw in the previous investigations was pointed out just for the sake of clarity. It does not point out any big change in the results. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1373421
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  • 6
    Digitale Medien
    Digitale Medien
    Role of quasineutrality in drift waves (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 368-369 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The ambiguity in using the quasineutrality approximation to describe the low-frequency plasma perturbations in nonuniform magnetized plasmas is pointed out. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1329654
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  • 7
    Digitale Medien
    Digitale Medien
    Comment on the thermoelectric term (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1169-1170 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: It is shown that the thermoelectric term which appears as a source of fluctuating magnetic field B1 in unmagnetized nonuniform plasmas in the limit ωpe(very-much-less-than)ω(very-much-less-than)ωpe [where ωpi(ωpe) are ion (electron) plasma oscillation frequencies, respectively] is of smaller order. Therefore, the thermoelectric term does not seem to contribute to magnetic fluctuations linearly. The theory of magnetic field generation based on ion dynamics predicts the same order of magnitude of B1 which is experimentally observed. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872205
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  • 8
    Digitale Medien
    Digitale Medien
    Formation of vortex chains in a nonuniform magnetized electron plasma (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3505-3507 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: It is shown that the equations governing the dynamics of weakly interacting medium-frequency electrostatic waves in a nonuniform magnetoplasma with a fixed ion background can have localized vortex chain solutions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.870927
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  • 9
    Digitale Medien
    Digitale Medien
    Dusty plasma near a conducting boundary (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3427-3431 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of dust particles or impurity ions on plasma–wall interaction is investigated using simple fluid models. It is shown that the behavior of the electrostatic potential as well as the particle densities can be considerably different from that of a two-component plasma.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.860398
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  • 10
    Digitale Medien
    Digitale Medien
    Self-modulation of magnetic electron drift waves (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2677-2679 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The self-modulation of a large-amplitude magnetic electron drift (MED) wave is considered. It is found that the dynamics of the modulated wave packet is governed by the cubic Schrödinger equation. Since, in the latter, the product of the group dispersion and the nonlinear frequency shift is negative, it turns out that the one-dimensional nonlinear modulated MED wave packet propagates in the form of a rarefactional pulse. The present nonlinear structure can possibly be associated with the magnetic cavity observed in the vicinity of the magnetopause.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.860188
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