摘要：结合微流体和磁控组装技术, 通过控制紫外光 (UV) 固化时间制备一维光子晶体碗, 实现复杂结构光子晶体的高效、简易制备。采用光学显微镜 (OM) 、场发射扫描电子显微镜 (SEM) 、热重-差示扫描分析 (TG-DSC) 和振动样品磁强计 (VSM) 等对产物进行结构与成分表征。结果表明:光子晶体碗显示靓丽的结构色;其内部嵌有由超顺磁性Fe₃O₄@PVP纳米粒子组成的一维链状结构;光子晶体碗的口径、碗底厚度和颜色可以通过成型过程中微流体油相流速、光固化时间和外加磁场强度等进行调控;光子晶体碗具有磁控开、关效应;独特的几何和光学结构使其具有自显示和比光子晶体球更靓丽的色彩, 反射强度高达20%;光子晶体碗的反射强度随口径的增大先增大后减小, 随碗底厚度的增加逐渐增强。

关键词：光子晶体碗；自显示；光学开关；反射强度

Abstract：The elaborate combination of magnetically induced self-assembly and microfluidic techniques as well as the control of UV light time was demonstrated to prepare complex structural one-dimensional photonic crystal (PC) bowls in simple but powerful method through curing polymerizable emulsion droplet uncompletely. The structure and component of the as-obtained product were characterized by OM, SEM, TG-DSC and VSM.The results show that it presents a bowl-like geometric structure, and periodical chain-like structures composed of superparamagnetic Fe₃O₄@PVP nanoparticles are embedded in polymer matrix. The diameter, the thickness of the bottom and the color of the PC bowl can be controlled by the flow rate of oil phase, UV photo-polymerization time and the strength of the magnetic field. The effects of diameter and thickness of PC bowl on optical property were also investigated. Because of the unique geometric and optical structure, PC bowl are capable of self-display, optical switch and strong reflection intensity. These remarkable properties endow PC bowl with promising applications in energy saving display, optical switcher and anti-counterfeiting materials.

Keywords：photonic crystal bowl；self-display；optical switcher；reflection intensity