Abstract: r to develop polypeptide-based second order nonlinear optical materials, we have derivatized succinylated poly(l- lysine) with a spiropyran. Spin coated thin films (2 $mu thickness) of this material on indium tin oxide-coated glass were corona-poled (6 $MUL 10$+5$/ V/m) under conditions of variable temperature. The degree of alignment and nonlinear optical properties were monitored by measurement of the intensity of second harmonic signal resulting from irradiation at 1064 nm. The dark-adapted polypeptide was in the spiropyran form. The second harmonic signal intensity was 20 times greater than that of the dark-adapted sample. The results demonstrate the feasibility of development of a light-activated nonlinear optical material. !11
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