Angle- and Polarization-Independent Structural Color Based on Controlled Phase and Gain Margins in Ultrathin Transparent Dielectrics
Angle- and Polarization-Independent Structural Color Based on Controlled Phase and Gain Margins in Ultrathin Transparent Dielectrics
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DOI：
10.1021/acsphotonics.3c00632
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发表时间：
2023-07-20
期刊：
影响因子：
7
通讯作者：
Chanda，Debashis
中科院分区：
文献类型：
--
作者：
Cencillo-Abad，Pablo;McCormack，Sean;Chanda，Debashis
对大自然色彩的迷恋，促使人类不断模仿和超越大自然的色彩。除了传统上对更鲜艳、更耐褪色的色彩感兴趣外，现代人更需要以无毒材料为基础，在不影响环境的情况下做到这一点。虽然大多数商业着色剂都是基于化学颜料，吸收与其电子和分子跃迁相匹配的光波长，但过去几十年来纳米纤维技术的发展促使研究人员研究结构色，其中颜色可以由无色材料制成精心设计的微米和纳米夹杂物。尽管已经报道了无数的这种配置用于产生颜色，但在大多数情况下，它们具有角度或偏振依赖性，或者需要昂贵的材料或不切实际的制造技术，这些技术与大规模生产不兼容。最近，已经提出了一些使用随机介质来减轻这些影响的方法。在这里，我们展示了一种基于无色镜和透明无损反射镜的方法，并展示了如何利用这种方法来产生一个完整的调色板，通过使用由钛及其氧化物薄膜组成的亚波长双层结构来生产廉价的结构色。此外，我们还介绍了一种增材制造工艺，只需三次连续蒸发即可从4种原色中创造出58种不同的色调。基于这个调色板，我们复制货车高的自画像上1平方英寸。该区域提供了该平台适用于大规模、低成本和环境友好型结构色生产的证明。
Fascination with nature’s color palette has propelled mankind’s efforts to imitate and surpass it. Apart from the traditional interests in brighter and more fade-resistant colors, the present time adds the need for doing so without impacting the environment based on nontoxic materials. Although most commercial colorants are based on chemical pigments that absorb wavelengths of light matching their electronic and molecular transitions, the development of nanofabrication techniques in the last decades has spurred researchers to study structural colors, where color can be made out of colorless materials by carefully designed micrometer and nanoscale inclusions. Although, a myriad of such configurations have been reported for the production of color, in most cases, they suffer from angle or polarization dependence or require expensive materials or impractical fabrication techniques that are incompatible with large-scale production. Recently, some approaches have been proposed for the use of random media to mitigate these effects. Here, we demonstrate an approach based on colorless mirrors and transparent lossless dielectrics and show how this can be harnessed to produce a full color palette by using a subwavelength bilayer structure composed of thin films of titanium and its oxide for the production of inexpensive structural color. Furthermore, we introduce an additive manufacturing process that creates 58 different hues from 4 primaries in only three sequential evaporations. Based on this color palette, we reproduce Van Gogh’s self-portrait on a 1 sq in. area providing proof of the applicability of the platform for large-scale, low-cost, and environmentally friendly production of structural colors.