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  • 1
    Online Resource
    Online Resource
    Bauelemente für die optische Nachrichtentechnik auf der Basis von Gitter-Wellenleiter-Strukturen : Abschlußbericht (2004)
    Berlin : Fraunhofer Inst. für Nachrichtentechnik Heinrich-Hertz-Inst.
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource (40 S., 1,92 MB) , graph. Darst
    URL: https://edocs.tib.eu/files/e01fb05/477348939.pdf
    URL: https://doi.org/10.2314/GBV:477348939
    URL: https://edocs.tib.eu/files/e01fb05/477348939l.pdf
    DOI: 10.2314/GBV:477348939
    Language: German , English
    Note: Förderkennzeichen BMBF 01 BP 703A , Auch als gedr. Ausg. vorhanden , Enth.: Devices for advanced optical networks / Tsvi Katchalsky; Guy Levy-Yurista; A. A. Friesem , Systemvoraussetzungen: Acrobat reader.
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  • 2
    Electronic Resource
    Electronic Resource
    Recording of mid-infrared radiation in photochromic polymers (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 4248-4250 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new system for real-time recording of mid-infrared laser radiation, comprising photochromic spiropyran–methylmethacrylate copolymers, is investigated. The laser radiation, derived from a CO2 laser, bleached pre-colored merocyanine, thereby converting it back to spiropyran. The exposure energies at 50% of the initial merocyanine optical density was about 0.1 J/mm2 at 10.6 μm laser wavelength and 0.2 J/mm2 at 10.5 μm. The sensitivity difference at the two laser wavelengths points to differences in thermal energy dissipation mechanisms. A resolution equal or better than 40 lines/mm was achieved, and holographic gratings can be recorded in the mid-infrared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354434
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of photodeposited selenium planar structures by scanning force microscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 6208-6213 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article describes the results of a surface morphology study of photodeposited thin film devices of Selenium by scanning force microscopy (SFM). First, the structures of the photodeposited films were investigated at device level dimensions of the order of visible wavelength. Specifically, ultrathin sinusoidal holographic gratings with spatial periods in the range 480–514 nm were visually identified from SFM nanograph images. Second, grain level structural investigation was performed using image processing techniques such as filtering and one- and two-dimensional Fourier transforms analysis. The variation of the surface grain structure was sampled across the Gaussian profiles of the laser photodeposited patterns. It was found that the random amorphous clustering at the perimeter of the deposited structures becomes progressively grainy towards the center, creating protrusions above the surface with trigonal Selenium (t-Se) crystalline features. Third, performing image enhancement analysis at high magnification—the nanometer level structure was investigated for amorphous Selenium (a-Se) and the laser thermally induced structural transformations of the a-Se films. It was found that the atomic solid-state structure of a-Se films, previously deduced only by indirect methods, consists mainly of a random mixture of Sex branched chains containing also a small concentration of imperfect ring structures characteristic of the α- and β-monoclinic phases. The triclinic crystalline phase (t-Se) was identified in the center of the laser overheated regions of the film Gaussian profile. The results enable us to conclude about the debate in the literature regarding the crystalline and amorphous structure of Selenium thin films. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359149
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Long-range surface plasmon resonances in grating-waveguide structures (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1210-1212 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resonant grating-waveguide structures were used for the excitation of long-range surface plasmons. Resonance spectral bandwidths of 1.9 nm were experimentally measured in both the reflected and transmitted intensities from these structures. Numerical calculations indicate that interference rather than the usual surface plasmon absorption mechanism plays the dominant role in the resonance response when the thickness of the guiding metal layer in the structures is reduced below 10 nm. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118532
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  • 5
    Electronic Resource
    Electronic Resource
    Concentration and collimation of diffuse linear light sources (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 334-336 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an approach for concentration and collimation of a diffuse linear light source to achieve extremely high concentration in the long direction at the expense of the short direction. The approach is based on free-space optics and involves either arrays of prisms or holographic optical elements that couple between the two spatial directions. The results for a specific arrangement that concentrates a 40 mm by 0.4 mm source, with diffusive angle of about 0.1 rad, into a 1 mm by 1 mm isotropic spot are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108950
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Diffractive elements for annular laser beam transformation (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 381-383 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A diffractive optical system for the transformation of an annular laser beam to a uniform circular beam is presented. It is composed of two diffractive elements which are recorded as surface relief transmission gratings with multilevel discrete binary steps. Our experiments with CO2 laser radiation show that high diffraction efficiencies and good uniformity of the output beam can be achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107889
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Narrow spectral bandwidths with grating waveguide structures (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 4154-4156 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Under certain conditions grating/waveguide structures have a resonant behavior with narrow spectral bandwidths. Several such structures were designed, fabricated, and evaluated, demonstrating resonances with narrow spectral bandwidths ranging to as low as 0.035 nm at full width at half maximum. These can be exploited as compact spectral filters having high finesse. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116969
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