Pc. Ray et Pk. Das, 2ND-HARMONIC GENERATION IN POLED MOLECULARLY DOPED POLYMER-FILMS - PUSH-PULL BUTADIENES IN POLY(METHYL METHACRYLATE) AND POLYSTYRENE, Chemical physics letters, 229(4-5), 1994, pp. 415-420
We report second harmonic generation in a new class of organic materia
ls, namely donor-acceptor substituted all-trans butadienes doped in po
ly(methyl methacrylate) or polystyrene and oriented by corona poling a
t elevated temperatures. Second harmonic measurements were made at roo
m temperature. The observed d(33) coefficients are greater than those
of potassium dihydrogen phosphate or 4-dimethylamino-4'-nitrostilbene
doped in similar polymer matrices. Rotational diffusion coefficients e
stimated from the decay characteristics of the second harmonic intensi
ty in the polymer films indicate that the polymer matrix plays a major
role in stabilizing the dopants in a nonlinear optics conducive envir
onment.