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How does light modify the surface of a photosensitive polymer? Upon polarized laser light irradiation of an azo-dye-substituted polymethacrylate film with copper nanocrystal islands periodic surface structures arise. Their morphology (see Figure for an AFM image, with ripple structures marked by arrows) suggests that these structures are interference patterns of incoming laser light with radiation emitted by the copper platelets, which act as dipoles.
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André et al. (2002) studied this question.
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