Li Chunfang, Xue Qihao, Ji Zhaoyang, Li Yaxia, Zhang Hongyan, Li Dongxiang
State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Soft Matter. 2020 Mar 28;16(12):3063-3068. doi: 10.1039/c9sm02449b. Epub 2020 Mar 5.
Photonic crystals (PCs) are periodic dielectric structures with photonic bandgaps and they can be used to control and manipulate photons effectively. Novel photonic crystal materials with tunable bandgaps can be prepared by changing the refractive index of the dielectric or lattice parameters under external stimuli, while using temperature to adjust the photonic band gap is a simple and convenient method. In this paper, silica PCs having different pseudo-gaps in the range of 450-750 nm were prepared with colloidal SiO spheres of different sizes. Thermo-sensitive PNIPAM hydrogel was then infiltrated into the PCs to obtain PNIPAM-PCs, whose pseudo-gap blue-shifted when the temperature was changed from 24 to 34 °C and exhibited good reversibility. The PCs with tunable bandgaps are significant for the development of integrated photonic devices, sensors, and in detection and other technologies.
光子晶体（PCs）是具有光子带隙的周期性介电结构，可用于有效控制和操纵光子。通过在外部刺激下改变电介质的折射率或晶格参数，可以制备具有可调带隙的新型光子晶体材料，而利用温度来调节光子带隙是一种简单便捷的方法。本文用不同尺寸的胶体SiO球体制备了在450 - 750nm范围内具有不同伪带隙的二氧化硅光子晶体。然后将热敏性聚N - 异丙基丙烯酰胺（PNIPAM）水凝胶渗入光子晶体中，得到PNIPAM - PCs，当温度从24℃变为34℃时，其伪带隙发生蓝移，且具有良好的可逆性。具有可调带隙的光子晶体对于集成光子器件、传感器以及检测等技术的发展具有重要意义。
