Improved performance of photorefractive polymers based on merocyanine dyes in a polar matrix

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  • Klaus Meerholz
    Physical Chemistry Department, University of Munich, Sophienstr. 11, D-80333 Munich, Germany
  • Yessica De Nardin
    Physical Chemistry Department, University of Munich, Sophienstr. 11, D-80333 Munich, Germany
  • Reinhard Bittner
    Physical Chemistry Department, University of Munich, Sophienstr. 11, D-80333 Munich, Germany
  • Rüdiger Wortmann
    Physical Chemistry Department, University of Mainz, Jakob-Welder-Weg 11, D-55099 Mainz, Germany
  • Frank Würthner
    Organic Chemistry Department, University of Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany

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<jats:p>Recently, chromophores with a large figure-of-merit for incorporation into photorefractive polymers with low glass-transition temperature have become available. However, their rather polar nature so far limited their use in typical nonpolar photoconducting matrices due to dye aggregation. By incorporation of an additional polar compound we were able to influence this situation favorably. The material we report here has a factor 4 to 5 (2) improved index modulation amplitude (gain coefficient) compared to the best previously known materials. The material is sufficiently resistant against phase separation and operates in the near infrared at typical wavelengths of commercially available high-power laser diodes.</jats:p>

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