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19 May 2000 Acentric nonlinear optical films by alternating polyelectrolyte deposition
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Proceedings Volume 3939, Organic Photonic Materials and Devices II; (2000)
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
Alternating polyelectrolyte deposition (APD) is a room temperature process that can produce noncentrosymmetric ordered films of nonlinear optical polymers (NLOP). Previous studies using a stilbazolium-substituted polyepichlorohydrin (SPECH) as the NLO-active polycation exhibited a saturation of the SHG signal independent of the number of deposited layers. This saturation effect was thought to be due a change in the charge density in the outermost layers. The charge density is the main driving force for chromophore alignment. In this study, NLO-inactive spacer layers were used to regenerate the charge density before continuing with deposition of NLO-active layers. The overall SHG signal from these 'multi-deck sandwich' films was higher than previously obtainable with SPECH as the NLO-active material. The surface morphology, roughness, and film thickness have been characterized by Tapping Mode Atomic Force Microscopy.
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M. Joseph Roberts and Warren N. Herman "Acentric nonlinear optical films by alternating polyelectrolyte deposition", Proc. SPIE 3939, Organic Photonic Materials and Devices II, (19 May 2000);

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