Weaving of highly oriented conjugated polymer/polyethylene tapes is demonstrated to permit the generation of concealed patterns that can be detected under appropriate polarized light illumination. This is achieved by exploiting the fact that the amount of transmitted light varies with the superposition sequence of semi-transparent objects that feature a high degree of linear birefringence as well as linear dichroism. An analysis based on Müller calculus provides a theoretical description of the observed optical behavior.
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See supplementary material at http://dx.doi.org/10.1063/1.4764518 for optical appearance of tapes woven at φB ∼ ±90°; estimate of the birefringence; calculation of the contrast between two adjacent weaves of opposite stacking sequence; and a plot of the maximum contrast as a function of φA.
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2012
American Institute of Physics
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