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  • 1
    Digitale Medien
    Digitale Medien
    An analysis of the anisotropic and topographic gratings in a side-chain liquid crystalline azobenzene polyester (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1518-1520 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have examined in detail the formation of surface relief structures in azobenzene polyesters formed by polarization holography with orthogonally circularly polarized laser beams. We show that it is possible to separate the contribution to the diffraction efficiency into an anisotropic part and a surface relief part by examining the polarization content of the first order diffracted beam. By studying the dynamics of the growth of the grating, we show that the gratings due to anisotropy and surface relief appear at the same time. Atomic force microscopic investigations of the film after irradiation reveal a strongly polarization dependent surface relief pattern. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.118605
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  • 2
    Digitale Medien
    Digitale Medien
    Optically induced surface relief phenomena in azobenzene polymers (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 519-521 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Azobenzene polymers and oligomers show intriguing surface relief features when irradiated with polarized laser light. We show through atomic force microscopic investigation of side-chain azobenzene polymers after irradiation through an amplitude mask that large peaks or trenches result depending on the architecture of the polymer. Extensive mass transport over long distances has been observed, paving the way for easy replication of nanostructures. We also show that it is possible to store microscopic images as topographic features in the polymers just through polarized light irradiation. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.123173
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  • 3
    Digitale Medien
    Digitale Medien
    Instant holography (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 3227-3229 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Instant photography, epitomized by Polaroid films is characterized by the rapid appearance of an image after exposure. We describe here an instant off-axis holographic process, characterized by exposures as short as 5 ns and an instant display process, not requiring any wet chemical processing. The holograms are made in a side-chain azobenzene polyester and can be erased through a thermal treatment of the film enabling the film to be reused. Significantly, an atomic force microscopic scan of the film shows a strong surface relief after the 5 ns exposure paving the way for a cheap, mass replication of the holograms using a micromolding technique. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.124113
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  • 4
    Digitale Medien
    Digitale Medien
    Atomic force and optical near-field microscopic investigations of polarization holographic gratings in a liquid crystalline azobenzene side-chain polyester (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1329-1331 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Atomic force and scanning near-field optical microscopic investigations have been carried out on a polarization holographic grating recorded in an azobenzene side-chain liquid crystalline polyester. It has been found that immediately following laser irradiation, a topographic surface grating structure appears. The time development of the grating structure was followed by atomic force microscopy for 20 h by repeatedly scanning the same area of the film. The grating structure disappears after a few hours and a pronounced increase of surface roughness has been found to take place. A near-field optical microscopic scanning of the grating reveals, however, that the bulk of the film remains optically anisotropic. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115924
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  • 5
    Digitale Medien
    Digitale Medien
    Novel biphotonic holographic storage in a side-chain liquid crystalline polyester (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1041-1043 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report novel biphotonic holographic storage of text and gratings on unoriented films of a side-chain liquid crystalline polyester capable of high density storage and complete erasure. The holograms have a typical size of 1 mm. The recording utilizes unusual photochemistry involving azo dye molecules. We believe that this technique would have a great potential in the recording of thousands of holograms in a two-dimensional plane, as for instance in text retrieval systems and in the fabrication of high density interconnects in optical neural networks.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.108788
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  • 6
    Digitale Medien
    Digitale Medien
    Novel Side-Chain Liquid Crystalline Polyester Architecture for Reversible Optical Storage (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 2172-2183 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00111a011
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  • 7
    Digitale Medien
    Digitale Medien
    Peptide oligomers for holographic data storage (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 505-508 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Optical storage in azobenzene-containing polymers is based on laser-induced photoisomerization of the chromophore. When irradiated in a certain wavelength range the azobenzene undergoes random reorientations through a number of tmns-cis-tmns isomerization cycles. A stationary orientation is ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/383505a0
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  • 8
    Digitale Medien
    Digitale Medien
    Optical Storage in Side-Chain Liquid Crystalline Polyesters (1994)
    Springer
    Optical review 1 (1994), S. 30-32 
    Details
    ISSN: 1349-9432
    Schlagwort(e): optical storage ; liquid-crystalline polyesters ; holography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Long-term, high resolution holographic storage has been achieved in side-chain liquid crystalline polyesters with high diffraction efficiency. The information can be completely erased by heating the film to about 80°C. The modular architecture of the polyesters permits a varition in the length of the main- and side-chains and the substituents of the azo chromophore. Each of these has a profound influence on the storage properties of the polyesters. In this article, we examine the influence of the length of the side-chains, the probe-beam-polarization dependence of the observed signal on the interface and the crystalline vs. amorphous nature of the films for optical storage.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s10043-994-0030-6
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  • 9
    Digitale Medien
    Digitale Medien
    Spatial Frequency Response and Transient Anisotropy in Bacteriorhodopsin Thin Films (1995)
    Springer
    Optical review 2 (1995), S. 32-38 
    Details
    ISSN: 1349-9432
    Schlagwort(e): bacteriorhodopsin thin films ; spatial frequency response ; photoinduced anisotropy ; transient effects ; pH value of gelatin matrix
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In this paper, we present new results describing the spatial frequency response in bacteriorhodopsin (bR), immobilised in gelatin films. It is shown that the spatial frequency response is flat, as compared to bR contained in solution form. An experimental investigation into the photoinduced anisotropy of bR films is also presented. It is shown that the anisotropy can be induced using two wavelengths (632.8 nm and 454 nm) and is dependent on the pH of the gelatin matrix, the 454 nm laser polarisation and the 454 nm pump power. The mechanisms producing the anisotropy are briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s10043-995-0032-z
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  • 10
    Digitale Medien
    Digitale Medien
    Lifetimes of some excited states in the rare earths: La ii, Ce ii, Pr ii, Nd ii, Sm ii, Yb i, Yb ii, and Lu ii (1975)
    Springer
    Solar physics 44 (1975), S. 257-267 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Radiative lifetimes for excited states in La ii, Ce ii, Pr ii, Nd ii, Sm ii, Yb i, Yb ii, and Lu ii have been determined by means of the beam-foil technique or the zero-field level-crossing method. The lifetimes for La, Ce, Pr, Nd, Sm, and Yb are shorter than those computed by summing the transition probabilities of Corliss and Bozman by a factor of up to ~5. The large discrepancies between the abundance of La, Ce, Pr, Nd, and Sm in the solar photosphere and in meteorites are eliminated or greatly reduced if the abundance determinations of the solar photosphere are based upon the gf values of Corliss and Bozman, corrected for by the present lifetimes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00153206
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