Berlin 2005 – wissenschaftliches Programm

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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.47: Poster

Montag, 7. März 2005, 18:00–20:00, Poster TU A

Organic photorefractive glasses with high transparency — •Andreas Gebhard¹, Denitsa Yancheva², Tsonko Kolev², and Rüdiger Wortmann¹ — ¹Kaiserslautern University of Technology, Erwin-Schrödinger Strasse, D-67663 Kaiserslautern — ²Institute of Organic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev. Str., 1113 Sofia, Bulgaria

Organic photorefractive (PR) materials offer a variety of interesting photonic applications. We have shown in previous work that the PR response of organic glasses with low glass transition temperature is optimized with neutral dipolar dyes close to the cyanine limit. Such chromophores may combine large ground state dipole moments with large anisotropies of their first-order polarizability. The optical absorption of such chromophores typically limits the PR response to the red or even NIR spectral region. In this contribution we present PR glasses which are almost transparent in the whole visible region. The PR properties of the materials were studied at various wavelengths from the red to the blue spectral region by the holographic-optical techniques of two-beam-coupling and four-wave mixing. The benefits of increased performance at shorter wavelengths based on the dispersion-enhanced Kerr susceptibility in the blue will be demonstrated.

[1] R. Wortmann, C. Poga, R.J. Twieg, C. Geletneky, C.R. Moylan, P.M. Lundquist, R.G. DeVoe, P.M. Cotts, H. Horn, J. Rice, D.M. Burland; J. Chem. Phys. 1996, 105, 10637.

[2] P.M. Lundquist, R. Wortmann, C. Geletneky, R.J. Twieg, M. Jurich, V.Y. Lee, C.R. Moylan, D.M. Burland; Science 1996, 274, 1182.