Polymeric dyes optical properties

A new type of nonlinear nano-layered polymeric optical material is described. The material comprises alternating polymer layers with thousands of layers and a layer thickness down to 30 nm or less. A nonlinear response is introduced by including an appropriate dye in alternate polymer layers. Such materials have several uses, including optical limiting. Several nano-layered materials using optical limiter dyes in alternate layers were fabricated. Some of the linear optical properties and a verification of nonlinear transmission and reflectivity at high intensity for example materials are reported. 

Optical Properties. When light falls on a nylon fiber, it can be partially transmitted, absorbed, or reflected, depending on the cross-section shape and the nature of any second substance added during polymerization or melt spinning. Additive-free nylon with a standard round cross section has a translucent high sheen luster. The inherent luster of the fiber and the color introduced in dyeing are important optical properties that relate to a fabric s visual quality and its acceptance by the customer. Fibers that need to be opaque or to cover well in... 

Third-order nonlinear optical properties (namely, quadratic electrooptic coefficient) of this polymeric system at different dye concentrations have been measured using a modified Michelson interferometer at 633nm. For this measurement, the polymer film was spin-coated from the filtered solution on an indium-tin-oxide (FTO) coated glass plate where the ITO layer was used as an electrode. A gold layer of 500A thickness was thermally evaporated onto the polymer film to form the second electrode. The experimental set-up of this modified Michelson interferometer is schematically shown in (Figure 7). 

Deshmukh RR, Malik MK (2013b) Photo-polymerization kinetics and electro-optical properties in mixtures of dichroic dye-doped nematic liquid crystal and photocurable polymer. Liq Cryst 40 1050-1059... 

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