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16 April 2008 Enigma of the second harmonic generation in oriented film of symmetric squaraine
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Second harmonic generation (SHG) in the oriented film of symmetric squaraine (Sq) was studied. Oriented Sq film on aligned polytetrafluoroethylyne (PTFE) sublayer prepared by vacuum deposition with subsequent rubbing using a cloth has been obtained. However, the mechanisms of orientation and SHG are still not clear. Methyl and ethyl substituted hydroxyl-Sq (OHSq) compounds formed oriented films with dichroic ratio of 8 on PTFE layer but with dichroic ratio of 1,5 on Teflon AF. Second layer deposition of Me-OHSq on Et-OHSq or of Et-OHSq on Me-OHSq led to an increase of the film dichroic ratio. Only the film, where Me-OHSq was first layer, exhibits an increase of SHG signal after deposition of second layer. Small differences in bi-layered OHSq films structure was detected by X-Ray diffraction (XRD) spectra.
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K. Grytsenko, Y. Slominski, O. Tolmachev, R. Resel, S. Ksensov, and S. Schrader "Enigma of the second harmonic generation in oriented film of symmetric squaraine", Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 699920 (16 April 2008);


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