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    Optically Induced Birefringence and Surface Relief Gratings in Composite Langmuir-Blodgett (LB) Films of Poly[4’-[[2-(methacryloyloxy)ethyl]ethylamino]-2-chloro-4-nitroazobenzene] (HPDR13) and Cadmium Stearate

    Year: 1999

    Journal: Macromolecules 1999, 32, 1493-1499, 20111221

    Authors: C. R. Mendonca, A. Dhanabalan, D. T. Balogh, L. Misoguti, D. S. dos Santos, Jr., M. A. Pereira-da-Silva, J. A. Giacometti, S. C. Zilio, and O. N. Oliveira, Jr.

    Organizations: Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, CP-369, 13560-970, Sao Carlos, SP, Brazil

    Photoinduced trans-cis-trans isomerization, optical storage, and surface relief gratings are demonstrated in mixed Langmuir-Blodgett (LB) films of poly[4'-[[2-(methacryloyloxy)ethyl]ethylamino]-2-chloro-4-nitroazobenzene] (HPDR13) and cadmium stearate (CdSt). The trans-cis-trans photoisomerization of the azobenzene chromophores from HPDR13 in the mixed LB film was achieved with a circularly polarized laser light. The birefringence induced by a linearly polarized laser light decreased with the number of layers and increased with the weight percentage of HPDR13 in the mixed LB film. The surface relief gratings recorded by exposing the mixed LB film to an interference pattern produced by the laser light were visualized through atomic force microscopy (AFM). Interestingly, it seems that the nonphotoactive CdSt domains have also migrated along with HPDR13 while recording the surface relief gratings.