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11 October 1999 Photochemical recording of an image with nonlinear optical properties in polymer layers
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The resistless process of the photochemical formation of nonlinear optical pattern in the polymer layer was elaborated. The illumination of the polymer donor-acceptor layers consisting of poly(hydroxyaminoester) as a donor and tetrabromomethane as an acceptor provides second harmonic generation (SHG) due to the photochemical formation of the Michler's hydrol blue like fragment (MHB+). The square root of the SH intensity, I0.5, linearly increases with the increase of exposure dose in region H <EQ 120 mJ cm-2. SHG is absent on unexposed areas of the same layer. SHG arises due to transformation of the geometry of MHB+ cation from centrosymmetric to noncentrosymmetric because of bond-length alternation under influence of Br counteranion.
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Antonina D. Grishina, Larisa Ya. Pereshivko, Tatyana V. Krivenko, Vladimir V. Savelyev, Eugene I. Mal'tsev, Leonid I. Kostenko, and Anatoly V. Vannikov "Photochemical recording of an image with nonlinear optical properties in polymer layers", Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999);

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