Abstract

We investigated the influence of blue light ($\lambda =450\mathrm{nm}$) on the optical properties of porous polyethylene terephthal ate (PET) films filled with a nematic liquid crystal (E7). In experiments, films of $12\mathrm{\mu m}$ thickness with randomly distributed open-end pores of well-defined diameters (170, 400, $850\mathrm{nm}$) were studied. It was found that blue-light illumination of the porous PET films preliminarily treated by an azo dye solution resulted in strong intensity changes when the He–Ne laser beam passed through the sample. The observed effect can be attributed to the heating caused by the absorption of blue light by azo dye molecules.

© 2010 Optical Society of America

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