9 February 2006 Photo-fluid and anisotropic photo-fluidity
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We report on a light-induced isothermal transition of a polymer film from an isotropic solid to an anisotropic liquid state in which the degree of mechanical anisotropy can be controlled by light. Whereas during irradiation by circular polarized light the film behaves as an isotropic viscoelastic fluid, it displays considerable fluidity only in the direction parallel to the light field vector under linear polarized light, demonstrating thus extraordinarily anisotropic mechanical properties. The fluidisation phenomenon is related to photoinduced motion of azobenzene-functionalised molecular units, which can be effectively activated only when their transition dipole moments are oriented close to the direction of the light polarization. Along with the phenomenological finding, our work allows us to make a substantial step in understanding the mass transport effect in azobenzene containing systems under conditions of far- and near-field illumination.
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Peter Karageorgiev, Peter Karageorgiev, Dieter Neher, Dieter Neher, Burkhard Schulz, Burkhard Schulz, } "Photo-fluid and anisotropic photo-fluidity", Proc. SPIE 6131, Nanomanipulation with Light II, 61310I (9 February 2006); doi: 10.1117/12.640805; https://doi.org/10.1117/12.640805

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