Enigma of the second harmonic generation in oriented film of symmetric squaraine

K. Grytsenko; Y. Slominski; O. Tolmachev; R. Resel; S. Ksensov; S. Schrader

doi:10.1117/12.780711

16 April 2008 Enigma of the second harmonic generation in oriented film of symmetric squaraine

K. Grytsenko, Y. Slominski, O. Tolmachev, R. Resel, S. Ksensov, S. Schrader

Proceedings Volume 6999, Organic Optoelectronics and Photonics III; 699920 (2008) https://doi.org/10.1117/12.780711
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.780711

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