Electrooptic activity

To provide a brief introduction into this peculiar class of polymer materials, in this chapter we first consider the elementary optical excitations, then discuss the electroluminescence, and finally deal with the conduction properties and the magnetism of doped samples. 

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The electron transporting 9-(dicyanovinyl)thioxanthene moiety and electrooptically active vinylaniline units have been combined in the succinate esters 601. The compounds exhibit good photorefractive properties with high optical quality <2003SM(139)11>. 

Fig-8. EO coefficient data, as a function of chromophore number density, for FTC (circles) and FTC-2H (diamonds) chromophores in PMMA. Also shown is the theoretical curve computed for FTC. Note that for FTC-2H, the two butyl groups (attached to the thiophene ring) are replaced by protons. The more ellipsoidal FTC-2H exhibits a smaller maximum electrooptic activity and the position of the maximum is shifted to lower number density. Consistent with EFISH, HRS, and other measurements, the dipole moments and molecular first hyperpolarizabilities of these two chromophores are comparable (The values for FTC-2H may be slightly larger)... 

Very recently, the first metathesis reaction was utilized to synthesize a new type of photorefractive polymers, based on poly(1.6-heptadiyne) derivatives, that contain both a carbazole moiety as a hole transporter and NLO chromophores. attached to TT-conjugated backbones. Photorefractive polymers based on the previous works for the photoconductivity of poly(1.6-heptadiyne) derivatives containing a carbazole moiety and electrooptic activity of poly(1.6-heptadiyne) derivatives containing NLO chromophores were developed.Herein, all functional groups are covalently linked to the polymer backbone. 

Individual molecules will contribute to macroscopic electro-optic activity in an additive manner hence, the linear dependence on chromophore number density, N, in the master equation for electrooptic activity, rss = 2N j8 /(principle element of the electro-optic tensor,... 

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