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Second Order Optical Effects In Multilayer Polymeric Thin Films

Multilayer Langmuir/Blodgett thin films provide a means of designing thin film optical devices monolayer by monolayer. A single layer of a hemicyanine dye or a mixture of hemicyanine dye and PMMA, as the polymeric host, produce second harmonic generation (SHG). With proper dipping procedure it is possible to deposit such films one monolayer at a time and maintain the noncentrosymmetric structure required for SHG. Addition of more layers of the same material increases the amount of generated second harmonic. This evidence of enhanced second harmonic generation in multilayer Langmuir/Blodgett thin films will be presented. Discussion of microwave detection using the linear electrooptic effect in slab and coated fiber structures will be presented. Some of the theoretical problems and advantages of using optical fibers coated by Langmuir/Blodgett films are discussed. Emphasis is placed on the importance of developing in situ diagnostic tools for use during deposition of the organic films.