Nonintrusively Adjusting Structural Colors of Sealed Two-Dimensional Photonic Crystals: Immediate Transformation between Transparency and Intense Iridescence and Their Applications.
Nonintrusively Adjusting Structural Colors of Sealed Two-Dimensional Photonic Crystals: Immediate Transformation between Transparency and Intense Iridescence and Their Applications.
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DOI：
10.1021/acsami.1c02083
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发表时间：
2021-03
影响因子：
9.5
通讯作者：
Yeguang Zhang;Yong Qi;Rongzi Wang;T. Cao;Wei Ma;Shufen Zhang
中科院分区：
文献类型：
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作者：
Yeguang Zhang;Yong Qi;Rongzi Wang;T. Cao;Wei Ma;Shufen Zhang
响应光子晶体（PC）可以根据外部刺激调整结构颜色，在显示器、传感器、可穿戴电子产品、加密和防伪方面显示出巨大的潜在应用。相比之下，外部刺激直接与有序阵列相互作用的传统结构侵入式调整方式可能会导致结构损坏或更长的响应时间。在这里，基于衍射理论探索了二维（2D）PC（2D-PC）结构颜色的非侵入性调整。制备了密封的2D-PC和2D反蛋白石光子晶体（IOPC）柔性器件。它们在空气中高度透明，但在浸入水中后立即表现出强烈的依赖于视角的结构颜色。布拉格定律解释了透明虹彩立即变换的机制。通过数值模拟和不同外部介质中的光谱偏移来检验设计机制。我们通过密封的2D-PC图案和密封在产品表面的2D IOPC自立式薄膜的透明虹彩即时变换来展示其在信息加密和防伪领域的应用。由于透明度和强烈虹彩之间的强烈对比、可逆和立即转变以及耐用性，通过非侵入性调整策略设计的密封2D-PC和2D IOPC柔性器件将在显示器、传感器、可穿戴电子产品、加密和防伪方面带来各种新的应用。
Responsive photonic crystals (PCs), which can adjust structural colors in response to external stimuli, show great potential applications in displays, sensors, wearable electronics, encryption, and anticounterfeiting. In contrast, conventional structure-intrusive adjustment manners that external stimuli directly interact with the ordered arrays may lead to structural damage or longer response time. Here, a noninvasive adjustment of the structural colors of two-dimensional (2D) PCs (2D-PCs) is explored based upon diffraction theory. Sealed 2D-PCs and 2D inverse opal photonic crystal (IOPC) flexible devices are prepared. They are highly transparent in air but immediately exhibit intense viewing angle-dependent structural colors after being dipped in water. The mechanism of transparent-iridescent immediate transformation is explained by Bragg's law. The design mechanism is examined by numerical simulation and spectral shifts in different external media. We demonstrate its applications in the fields of information encryption and anticounterfeiting by using the transparent-iridescent immediate transformation of sealed 2D-PC patterns and 2D IOPC free-standing films sealed on the product surface. Because of the strong contrast between transparency and intense iridescence, reversible and immediate transformation, and durability, sealed 2D-PCs and 2D IOPC flexible devices designed by the noninvasive adjustment strategy will lead to a variety of new applications in displays, sensors, wearable electronics, encryption, and anticounterfeiting.