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14 September 2006 Linear and nonlinear optical properties in new cyanine dye Langmuir-Blodgett multilayers
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We investigated on cyanine dye (HQ) in Langmuir and Langmuir-Blodgett (LB) films using UV-visible spectra and second-harmonic generation (SHG) methods. UV-visible spectra indicated a uniform film transfer. The significant SHG fringe signal as a function of angle of incidence for Z-type LB films observed respectively. The second-order susceptibility χ(2)zzz, refractive indexes at 532 nm as well as the average tilt angle ψ between the molecular (dipolar) axis and surface normal, obtained by means of fitting the SHG data, are 42 pM/V-1, 1.4841, 57° and 32 pM/V-1, 1.4775, 53° for LB films without and with Cd2+ ions, respectively. These high nonlinearities are due to resonant enhancement resulting from the proximity of the second harmonic wavelength to the absorption band of the films.
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Chuang Wang, Feng Gao, Hao Zeng, Shihong Ma, Wei Liu, Liying Liu, Wencheng Wang, and He Tian "Linear and nonlinear optical properties in new cyanine dye Langmuir-Blodgett multilayers", Proc. SPIE 6331, Linear and Nonlinear Optics of Organic Materials VI, 633114 (14 September 2006);

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