Gradient Photonic Materials Based on One-Dimensional Polymer Photonic Crystals.,Macromolecular Rapid Communications

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Gradient Photonic Materials Based on One-Dimensional Polymer Photonic Crystals.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-03-13 , DOI: 10.1002/marc.202000069
Andreas E Schedl ₁ , Irene Howell ₂ , James J Watkins ₂ , Hans-Werner Schmidt ₁

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In nature, animals such as chameleons are well-known for the complex color patterns of their skin and the ability to adapt and change the color by manipulating sophisticated photonic crystal systems. Artificial gradient photonic materials are inspired by these color patterns. A concept for the preparation of such materials and their function as tunable mechanochromic materials is presented in this work. The system consists of a 1D polymer photonic crystal on a centimeter scale on top of an elastic poly(dimethylsiloxane) substrate with a gradient in stiffness. In the unstrained state, this system reveals a uniform red reflectance over the entire sample. Upon deformation, a gradient in local strain of the substrate is formed and transferred to the photonic crystal. Depending on the magnitude of this local strain, the thickness of the photonic crystal decreases continuously, resulting in a position-dependent blue shift of the reflectance peak and hence the color in a rainbow-like fashion. Using more sophisticated hard-soft-hard-soft-hard gradient elastomers enables the realization of stripe-like reflectance patterns. Thus, this approach allows for the tunable formation of reflectance gradients and complex reflectance patterns. Envisioned applications are in the field of mechanochromic sensors, telemedicine, smart materials, and metamaterials.

中文翻译：

基于一维聚合物光子晶体的梯度光子材料。

在自然界中，诸如变色龙之类的动物以其皮肤的复杂颜色图案以及通过操纵复杂的光子晶体系统来适应和改变颜色的能力而闻名。这些颜色图案激发了人工梯度光子材料的发展。在这项工作中提出了制备这种材料及其作为可调节的机械变色材料的功能的概念。该系统由1D聚合物光子晶体（厘米级）在弹性聚（二甲基硅氧烷）基板的顶部，并具有刚度梯度。在未应变状态下，该系统在整个样品上显示出均匀的红色反射率。在变形时，形成基板的局部应变的梯度并将其转移至光子晶体。根据局部应变的大小，光子晶体的厚度连续减小，从而导致反射峰的位置随蓝移而变化，因此颜色呈彩虹状。使用更复杂的硬-软-硬-软-硬梯度弹性体可以实现条纹状反射率图案。因此，该方法允许反射率梯度和复杂反射率图案的可调形成。预期的应用在机械变色传感器，远程医疗，智能材料和超材料领域。这种方法允许反射率梯度和复杂反射率图案的可调形成。预期的应用在机械变色传感器，远程医疗，智能材料和超材料领域。这种方法允许反射率梯度和复杂反射率图案的可调形成。预期的应用在机械变色传感器，远程医疗，智能材料和超材料领域。

更新日期：2020-04-22

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