Abstract
Alternating Langmuir-Blodgett films were prepared for second harmonic (SH) generation from an “active” polymer containing a hemicyanine chromophore and various “passive” polymers. With the best “passive” polymer, films containing up to 300 active layers (600 layers in total with a total thickness of 1.5 μm) had the intensity of the SH signal produced from incident light of wavelength 1.064 μm proportional to the square of the number of active layers. The intensity of the SH signal was unchanged after the film had been left in the dark at 20 °C for 8 months. Over a period of 4 days the intensity of the SH signal was stable at 60 °C, but unstable at 80 °C.
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