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20 April 2006 Shedding incoherent light on walking and talking molecules
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Although coherent light is usually required for the self-organization of regular spatial patterns from optical beams, we show that peculiar light matter interaction can break this evidence. In the traditional method to record laser-induced periodic surface structures, a light intensity distribution is produced at the surface of a polymer film by an interference between two coherent optical beams. We report on the self-organization followed by propagation of a surface relief pattern. It is induced in a polymer film by using a low-power and small-size coherent beam assisted by a high-power and large-size incoherent and unpolarized beam. We demonstrate that we can obtain large size and well organized patterns starting from a dissipative interaction. Our experiments open new directions to improve optical processing systems. We also discuss the relevance of our experiment to other systems such as social insects, for which a self-assembly or spatial pattern is organized within a collective group, starting from amplified fluctuations.
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S. Ahmadi Kandjani, R. Barille, J.-M. Nunzi, E. Ortyl, and S. Kucharski "Shedding incoherent light on walking and talking molecules", Proc. SPIE 6195, Nanophotonics, 61951E (20 April 2006);

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