结构着色
光子晶体
反射(计算机编程)
光子学
材料科学
吸收(声学)
胶体晶体
布拉格定律
光学
光电子学
Crystal(编程语言)
胶体
化学
物理
计算机科学
物理化学
衍射
程序设计语言
作者
Yi‐Yang Zhan,Daisuke Ogawa,Koki Sano,Xiang Wang,Fumito Araoka,Nobuyuki Sakai,Takayoshi Sasaki,Yasuhiro Ishida
标识
DOI:10.1002/anie.202311451
摘要
Unlike absorption-based colors of dyes and pigments, reflection-based colors of photonic crystals, so called "structural colors", are responsive to external stimuli, but can remain unfaded for over ten million years, and therefore regarded as a next-generation coloring mechanism. However, it is a challenge to rationally design the spectra of structural colors, where one structure gives only one reflection peak defined by Bragg's law, unlike those of absorption-based colors. Here, we report a reconfigurable photonic crystal that exhibits single-peak and double-peak structural colors. This photonic crystal is composed of a colloidal nanosheet in water, which spontaneously adopts a layered structure with single periodicity (407 nm). After a temperature-gradient treatment, the photonic crystal segregates into two regions with shrunken (385 nm) and expanded (448 nm) periodicities, and thus exhibits double reflection peaks that are blue- and red-shifted from the original one, respectively. Notably, the transition between the single-peak and double-peak states is reversible.
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