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Proceedings Paper

New composite blue sensitive materials for high resolution optical data storage
Author(s): L. Criante; R. Castagna; F. Vita; D. E. Lucchetta; F. Simoni; S. Frohmann; T. Feid; S. Orlic
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Paper Abstract

In the last three decades several kinds of organic mixtures for holographic recording were developed in order to achieve a new class of DVD-like optical memories for high-density optical data storage. The holographic materials should satisfy the following requirements: high sensitivity to blue light, low losses, high spatial resolution and long term stability. To this aim we developed new organic photosensitive mixtures based on only three components. We recorded high spatial frequency reflection gratings up to 7400 lines/mm with blue laser light (405 nm) by using a conventional holographic setup. We obtained a macro grating diffraction efficiency up to 67%, refractive index modulation over 0.01, optical shrinkage < 2 % and overall losses ~5%. In order to characterize data-storage materials independently on the experimental conditions, the sensitivity has been evaluated through the S parameter which takes into account the diffraction efficiency, recording light intensity, exposure time and sample thickness. The amazing obtained values of S >105 cm/J evidences a very fast recording process with a very low writing intensity (less than 20 mW/cm2) corresponding to a recording energy density of few mJ/cm2. The performance of these materials have been also tested in the microholographic geometry.

Paper Details

Date Published: 18 September 2007
PDF: 9 pages
Proc. SPIE 6657, Organic 3D Photonics Materials and Devices, 665704 (18 September 2007); doi: 10.1117/12.736010
Show Author Affiliations
L. Criante, Univ. Politecnica delle Marche (Italy)
CNISM-MATEC, Univ. Politecnica delle Marche (Italy)
R. Castagna, Univ. Politecnica delle Marche (Italy)
CNISM-MATEC, Univ. Politecnica delle Marche (Italy)
F. Vita, Univ. Politecnica delle Marche (Italy)
CNISM-MATEC, Univ. Politecnica delle Marche (Italy)
D. E. Lucchetta, Univ. Politecnica delle Marche (Italy)
CNISM-MATEC, Univ. Politecnica delle Marche (Italy)
F. Simoni, Univ. Politecnica delle Marche (Italy)
CNISM-MATEC, Univ. Politecnica delle Marche (Italy)
S. Frohmann, Technical Univ. Berlin (Germany)
T. Feid, Technical Univ. Berlin (Germany)
S. Orlic, Technical Univ. Berlin (Germany)


Published in SPIE Proceedings Vol. 6657:
Organic 3D Photonics Materials and Devices
Susanna Orlic; Klaus Meerholz, Editor(s)

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