A Light‐Switchable Liquid Metamaterial Mirror,Advanced Optical Materials

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A Light‐Switchable Liquid Metamaterial Mirror
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-06-11 , DOI: 10.1002/adom.202000396
Sean Cormier ₁ , Andrew R. Salmon ₁ , Dean Kos ₁ , Jeremy J. Baumberg ₁

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A metamaterial film composed of gold nanoparticles wrapped in thin thermoresponsive polymer shells is described. The nanoparticle shells are kept partially hydrated so that the film acts as a “liquid mirror” and shows subtle interactions due to its composite metamaterial nature. Optically heating the film collapses the polymer, increasing the gold fill fraction and raising the reflectivity. This in turn decreases the optothermal absorption, making both the reflectivity and optothermal absorption nonlinear. When the polymer collapses, the film buckles due to thermophoretic flows competing against surface tension. These interactions generate a remarkable array of dynamic behaviors. Exposing the films to light causes an insulator‐to‐metal transition. Defects can be healed by returning the film to the liquid phase. Laser illumination of micrometer‐scale regions generates local dimples at low power and sinters microscale tracks at high power. When microbeads are combined into these films, optical switching results in quenching of their photoluminescence as well as the ability to manipulate their spatial position in real time.

中文翻译：

光开关液体超材料反射镜

描述了由包裹在薄的热响应性聚合物壳中的金纳米颗粒组成的超材料膜。纳米颗粒的壳保持部分水合，因此该膜充当“液体镜”，并由于其复合超材料的性质而表现出微妙的相互作用。光学加热薄膜会使聚合物塌陷，从而增加金的填充率并提高反射率。这进而降低了光热吸收，从而使反射率和光热吸收均为非线性。当聚合物崩溃时，由于热泳流动与表面张力竞争而使薄膜弯曲。这些相互作用产生了一系列惊人的动态行为。将膜暴露在光下会导致绝缘体过渡到金属。可以通过使薄膜返回液相来修复缺陷。微米级区域的激光照射在低功率下会产生局部酒窝，而在高功率下会烧结微尺度的轨道。当将微珠结合到这些薄膜中时，光学转换会导致其光致发光的淬灭以及实时操纵其空间位置的能力。

更新日期：2020-06-11

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