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Analysis Of Linear And Quadratic Optical Response Of Mixed Langmuir-Blodgett Films Of Stearic Acid And 5-Ct, Marc In Het Panhuis, R W. Munn

Australian Institute for Innovative Materials - Papers

Published experimental optical second-harmonic generation (SHG) results for mixed films formed between stearic acid and the mesogen 5-CT (4^″-n-pentyl-4-cyano-p-terphenyl) are reanalyzed. Experimental refractive index results for the pure films are used to deduce molecular polarizabilities in order to calculate local fields. At low and high fractions of 5-CT, a consistent interpretation of the SHG is obtained using a mean molecular response based on a fixed axial hyperpolarizabilityβ_LLL for the mesogen, but at high mesogen fractions molecular tilt makes small off-diagonal componentsβ_LLM≈−β_LLL/40 essential. At intermediate fractions the treatment can interpret …