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Microscopic Treatment Of Substrate Effects On Linear And Quadratic Optical Response Of Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Microscopic Treatment Of Substrate Effects On Linear And Quadratic Optical Response Of Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Australian Institute for Innovative Materials - Papers
Microscopic calculations are reported of linear and quadratic nonlinear optical response in model Langmuir-Blodgett films on a substrate, which is treated by the method of images. The effect of the substrate is significant in the first two layers, and is greatest for tilted molecules with their head groups adjacent to the substrate. The main qualitative effect is to lower the symmetry relative to a free-standing film. Calculations for stearic acidfilms show that the substrate effect is most important for molecules with nonuniform response on a metallic substrate.
Microscopic Calculations Of Linear And Quadratic Optical Response In Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Microscopic Calculations Of Linear And Quadratic Optical Response In Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Australian Institute for Innovative Materials - Papers
Microscopic calculations are reported of linear and quadratic nonlinear optical response in Langmuir–Blodgett films. The films are modeled as ordered layers of molecules that can tilt from the vertical and have a higher polarizability and first hyperpolarizability in the head than in the tail. The local electric field varies little after the first layer and negligibly after the second, which simplifies the analysis. Tilted two-layer Y-type films can have quadratic susceptibility components as large as X- or Z-type ones. Overall the results provide a systematic account of the linear and nonlinear optical properties as a function of …
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
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 hyperpolarizabilityβLLL for the mesogen, but at high mesogen fractions molecular tilt makes small off-diagonal componentsβLLM≈−βLLL/40 essential. At intermediate fractions the treatment can interpret …