Langmuir-Blodgett films nonlinear optical properties

Nonlinear Optical Properties of Langmuir-Blodgett Films Containing C60 and Derivatives... 

The material system is a Langmuir-Blodgett film of the S enantiomer of a chiral polymer deposited on a glass substrate. The polymer is a poly(isocyanide)30 functionalized with a nonlinear optical chromophore (see Figure 9.14). In this particular system the optical nonlinearity and chirality are present on two different levels of the molecular structure. The chirality of the polymer is located in the helical backbone whereas the nonlinearity is present in the attached chromophores. Hence, this opens the possibility to optimize both properties independently. 

Ashwell, G. J., Wong, G.M. S., Bucknall, D. G., Bahra, G. S. and Brown, C. R. (1997). Neutron reflection from 2,4-bis(4-(A-methyl-A-octylamino)phenyl)squaraine at the air-water interface and the linear and nonlinear optical properties of its Langmuir-Blodgett and spin-coated films. Langmuir, 13,1629-33. [205]... 

In this paper we report phase-matched second-harmonic generation in nonlinear optically active Langmuir-Blodgett (LB) film waveguides both by mode conversion and by use of the Cerenkov-type configuration. The experiments were done in 2-docosylamino-S-nitropyridine (DCANP) LB films (Hg.l). The synthesis, the optimum conditions for LB film transfer and the linear and nonlinear optical properties of this material have been described elsewhere [4-6]. 

Sheng-Gao, L., L. Yun-Qi, Yu Xu, Z. Dao-Ben, Y. An-Chi, and Z. Xing-Sheng (1998). Synthesis, Langmuir-Blodgett film, and second-order nonlinear optical property of a novel asymmetrically substituted metal-liee phthalocyanine. Langmuir 14, 690. 

Many examples of hemicyanine dyes with rare-earth tetrakis -diketonate complexes incorporated into Langmuir-Blodgett films have been described in the literature. These rrraterials are discussed in section 7.7. The rare-earth complex does not only improve the qrrality of the LB-films, but better nonlinear optical properties were foimd as well. Pavier et al. (1997) investigated the photoluminescence of LB-films in which ytterbium(III) complexes of pyrazolone ligands were used as counter ions. The fluorescence of the hemicyanine ligand was observed in the visible region, and metal-centered luminescence of Yb + in the near-infrared region. 

Molyneux, S., Matsuda, H., Kar, A. K., Wherrett, B. S., Okada, S., and Nakanishi, H., Third-order optical properties of poly-DCH thin single crystals. Nonlinear Opt., 4, 299, 1993. Kajzar, F. and Messier, J., Solid state polymerization and optical properties of diacetylene Langmuir-Blodgett multilayers. Thin Solid Films, 99, 109, 1983. 

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