摘要：

The dependence of the anisotropic absorption coefficient on the thickness of a polarizing layer, which is a molecularly oriented film of an organic dye, is studied. The polarizing layer, gray in color and 340-1200 nm thick, is formed on the surface of a polyethylene terephthalate film from water-soluble dyes. The dyes are the mixture of sulfonation products of indanthrone and dibenzimidazole derivatives of naphthalene- and perylenetetracarboxylic acids. The absorption coefficients, k∥ and k⊥, of a polarized light are measured in the parallel and orthogonal directions with respect to the orientation field. It is found that with increasing film thickness k∥ remains unchanged, whereas k⊥ decreases. This result is explained by the orientational disordering of dye molecules, which occurs solely in the plane perpendicular to the direction of the orientation field.

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