Polyvinyl alcohol (PVA) films modified with Ag nanoparticles and orientated by single‐axial tension do not possess dichroism at light passing as well as the film that is cross‐linked under the action of bichromates and UV light. These films are double‐ray refracting and behave themselves as phase plates that transform linearly polarized incident radiation to elliptically polarized one. The film of latter type has optical properties of reflective diffuse polarizer with polarizing ability ~0.8 in the range of observation angles from 20° to 80°.
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Агабеков et al. (2012) studied this question.
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