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Photo-fluids as optical sensors and data storage materials

机译：光流体作为光学传感器和数据存储材料

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An increase in stochastic molecular vibrations of a solid due to heating above the melting point leads to a decrease in its long-range order and a loss of structural symmetry. Therefore conventional liquids are isotropic media. We report on a light-induced isothermal phase transition of polymer materials 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 materials behave as an isotropic viscoelastic fluid, they display considerable fluidity only in the direction parallel to the light field vector under linear polarized light. In this case the polymers behave visually as a liquid along one direction and as a solid in others (one-direction liquid-state), 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. We also show that the selective excitation of chromophores orientated parallel to the light polarization not only has great influence on the anisotropy of the mechanical properties of the materials, but also induces an anisotropic expanding force, which can be used for polarization-selective opto-mechanical actuators and sensors.
机译：由于加热到熔点以上而导致的固体随机分子振动的增加导致其长程顺序的减小和结构对称性的损失。因此，常规液体是各向同性的介质。我们报告了聚合物材料从各向同性固体到各向异性液态的光诱导等温相变，其中机械各向异性的程度可以通过光来控制。在圆偏振光照射下，材料表现为各向同性的粘弹性流体，而在线性偏振光下，它们仅在平行于光场矢量的方向上显示出相当大的流动性。在这种情况下，聚合物在一个方向上在视觉上表现为液体，而在另一方向上则表现为固体（单向液态），因此表现出非同寻常的各向异性机械性能。流化现象与偶氮苯官能化分子单元的光诱导运动有关，只有当它们的跃迁偶极矩取向接近光偏振方向时，才能有效地激活它们。我们还表明，平行于光偏振定向的发色团的选择性激发不仅对材料的机械性能的各向异性有很大影响，而且还引起各向异性的膨胀力，可用于偏振选择光机械执行器和传感器。

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