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  • 2000-2004  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear excitation of AgBr nanocrystals in the field of short light pulses (2000)
    Springer
    Optics and spectroscopy 88 (2000), S. 50-54 
    Details
    ISSN: 1562-6911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Processes of the electron-hole pair generation and excited-state relaxation at earlier stages of the latent image formation in the AgBr nanocrystals are studied theoretically. The experimental dependence of the photographic blackening D in the field of the intense laser light on the light pulse energy I is analyzed in the range of pulse durations τi from 10−13 to 10−8 s. The values of I needed to obtain a fixed blackening D at τi∼10−10 s exceeded those at τi∼10−8 s by three orders of magnitude. However, as τi further decreased to hundreds of fs, these values decreased by two orders of magnitude. It is shown that experimental nonmonotonic dependences can be explained by saturation of the one-photon interband generation of electron-hole pairs accompanied by the development of the two-photon generation. For shortest pulses and, correspondingly, greatest light intensities, the pair generation rate varies more strongly than upon usual two-photon absorption, which is caused by the resonance optical Stark effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.626746
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nonlinear susceptibilities of quantum dots (2000)
    Springer
    Optics and spectroscopy 88 (2000), S. 390-396 
    Details
    ISSN: 1562-6911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the framework of the simplest model of a material with semiconductor spherical quantum dots, taking no account of excitonic effect, calculations are made of the magnitude and dispersion of the cubic susceptibility χ(3) in the frequency region found far from the fundamental-absorption edge. Moreover, the dependence of χ(3) on the field strength E of a strong electromagnetic wave is studied. This dependence is rather well pronounced for E〉106 V/cm. It is shown that a substantial contribution to χ(3) is made by a large number of discrete states into which the valence and conduction bands are split in the presence of three-dimensional confinement. If the light frequency is close to resonance with the transition between sublevels of size quantization of one of the bands, χ(3) sharply increases. Under conditions where quantum dots occupy less than 0.1% of the total volume of a material, the nonlinear susceptibility may reach values of the order of ∼10−7 CGS electrostatic units for the band gap of the dot material E g ≃ 3 eV, and it increases as E g −4 with decreasing E g .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.626808
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlinear optical polarization effects in quantum-dot materials (2000)
    Springer
    Optics and spectroscopy 88 (2000), S. 898-903 
    Details
    ISSN: 1562-6911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The amplitude and dispersion of the cubic susceptibility-tensor components χ ijkl (3) (−Ω; Ω, ω, −ω) and of their combinations responsible for the Kerr and Faraday optical effects, as well as for the self-rotation of the polarization ellipse, are calculated within a simple model of a material with semiconducting spherical quantum dots without the inclusion of the excitonic effects and of processes of higher orders in field. It is shown that the susceptibilities increase smoothly in amplitude below the two-photon absorption threshold while remaining negative. Above the threshold, the susceptibilities exhibit sharp maxima associated with two-photon resonances. The regions with positive and negative real parts of the χ(3) tensor components alternate. The magnitude of the induced linear or circular birefringence obtained suggest the possibility of using the nonlinear optical polarization effects in these materials to control light with short, high-intensity light pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.626897
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  • 4
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    Cascade avalanche production of electron-hole pairs in type II quantum wells (2003)
    Springer
    Details
    Publication Date: 2003-03-01
    Print ISSN: 1063-7761
    Electronic ISSN: 1090-6509
    Topics: Physics
    Published by Springer
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