Nonlinear Optical Processes in Organic and Polymeric Crystals and Films.
Final rept for period ending 14 May 85,
PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSICS
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Physical studies have demonstrated that organic and polymer structures possess unusually large, ultrafast second and third order nonlinear optical properties, in a large number of material structures, phases, and states that include organic crystals, monomolecular films, polymer structures, liquid crystals and liquid crystal polymers. For two such polymer systems, PBI and PBT, third harmonic generation measurements show that they possess large non-resonant third order optical susceptibilities whose origin resides in ultrafast, lossless excitations of highly charge correlated pi-electron states. Multilayer thin films have been fabricated as organic superlattices by the Langmuir-Blodgett technique to produce finite sequences of from one to several hundred molecular monolayers of different amphiphilic molecules. When one of the molecules contains a pi-electron system the macroscopic nonlinear optical properties of such thin films can be controlled.