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  • Second-harmonic generation  (2)
  • Image pre-processing  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Second-order susceptibilities of anisotropic liquid-crystal thin films (1992)
    Springer
    Molecular engineering 1 (1992), S. 341-355 
    Details
    ISSN: 1572-8951
    Keywords: Second-harmonic generation ; liquid crystals ; orientation analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Using optical second-harmonic generation, we have measured the anisotropic orientation behavior of liquid crystal (LC) molecules in thin films. A high degree of in-plane anisotropy was obtained by depositing the LC films onto rubbed polyimide-covered substrates. The analysis with respect to the relevant second-order susceptibility tensor components is based upon the experimental results obtained in transmission geometry using different angles of incidence for the separation of isotropic and anisotropic contributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176806
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorbate-surface interaction studied by second-harmonic generation in total reflection (1991)
    Springer
    Molecular engineering 1 (1991), S. 179-190 
    Details
    ISSN: 1572-8951
    Keywords: Second-harmonic generation ; adsorbate-surface interaction ; LB-type monolayer ; concentration series ; total reflection geometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We have studied the coherent superposition of nonlinear optical signals due to the substrate background and an organic surface layer deposited on this substrate by second-harmonic generation (SHG). The increased sensitivity of the total reflection geometry used permits identification of subtle details of this superposition; for example partial cancellation of the phase-reversed SH-signals or the observation of a coverage-density-dependent tilt angle of the organic chromophores. The second-harmonic signals from the Langmuir-Blodgett-type monolayers exceed the SH-response of the adsorbates prepared by simple wetting with chloroform solutions of the same amphiphilic dyes by two orders of magnitude under identical coverage-density conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00161662
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phase Grating from Ordered Polymer Lattices for Optica Image Preprocessing (1997)
    Springer
    Journal of biological physics 23 (1997), S. 73-88 
    Details
    ISSN: 1573-0689
    Keywords: OPTO-RETINA ; 3D grating ; 3D vision ; 4D vision ; Colour vision ; Polymer ; Latex ; Image pre-processing ; Diffraction ; Conoscopical microscopy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract The ‘inverted’ retina of the human eye can beemulated by multilayer gratings from polymer latexparticles located in the image plane of opticalsystems. This so called OPTO-RETINA provides v. Laueinterference patterns in visible light with atrichromatic characteristic containing,simultaneously, local spatiotemporal direction anddistance information, which are relevant to 3Dspatial vision and 4D spatiotemporal Fouriercorrelator-optical preprocessing in shape andmotion analysis.As a first step in the realization of OPTO-RETINAproperties the formation of hexagonally orderedmonolayers of polystyrene latex sphereswith diameters in the~μm range is reported and firstresults of diffraction and dispersion of white lightby these layers obtained by conoscopical opticalmicroscopy are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004932705351
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    Paper (German National Licenses)
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