Liu Xiaomiao, Zhao Duobiao, Geng Chong, Zhang Lijing, Tan Tianya, Hu Mingzhe, Yan Qingfeng
Department of Chemistry, Tsinghua University, Beijing 100084, China.
Department of Physics, Liaoning University, Shenyang 110036, China.
J Colloid Interface Sci. 2014 Nov 15;434:98-103. doi: 10.1016/j.jcis.2014.07.006. Epub 2014 Aug 13.
We describe the transformation of a colloidal photonic crystal into a photonic crystal heterostructure. It was achieved by annealing a polystyrene multilayer colloidal photonic crystal partially immersed in water using a solvent vapor. The floating polystyrene colloidal photonic crystal was divided into two parts by the liquid level, which can be manipulated by the addition of ethanol into the water. The top part protruding out of the water experienced a uniform lattice stretching upon exposure to the solvent vapor. The bottom part that stayed immersed in the water remained unaffected due to the protection by the water. The inconsistent behaviors of the two parts resulted in the formation of a colloidal photonic crystal heterostructure. Such a heterostructure was free of interface imperfection since it was a direct descendant of the original colloidal crystal. Meanwhile, optical measurements demonstrated the presence of a wider photonic band gap along the crystallographic [111] direction in these photonic crystal heterostructures compared with the original colloidal photonic crystals.
我们描述了一种将胶体光子晶体转变为光子晶体异质结构的方法。这是通过使用溶剂蒸汽对部分浸入水中的聚苯乙烯多层胶体光子晶体进行退火来实现的。漂浮的聚苯乙烯胶体光子晶体被液位分为两部分，可通过向水中添加乙醇来操控。露出水面的顶部在暴露于溶剂蒸汽时经历了均匀的晶格拉伸。由于水的保护，浸没在水中的底部未受影响。两部分的不同行为导致了胶体光子晶体异质结构的形成。这种异质结构没有界面缺陷，因为它是原始胶体晶体的直接衍生结构。同时，光学测量表明，与原始胶体光子晶体相比，这些光子晶体异质结构在晶体学[111]方向上存在更宽的光子带隙。
