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Thermal Responsive Photonic Crystal Achieved through the Control of Light Path Guided by Phase Transition.
Small ( IF 13.0 ) Pub Date : 2020-07-23 , DOI: 10.1002/smll.202002319
Fangfang Liu 1 , Shufen Zhang 1 , Yao Meng 2 , Bingtao Tang 1, 2
Affiliation  

Responsive photonic crystal is widely considered in the field of anti‐counterfeiting and information encryption because of their structural color changes caused by external stimulation. However, the response signal is usually achieved by adjusting the periodic lattice constant based on Bragg's law with volume changes. Thus, it is a great challenge to achieve the response of photonic crystals by non‐array parameter control. Herein, novel thermal responsive photonic crystal (TRPC) with low angle dependent structural color is fabricated by introducing poly(ethylene glycol) into the structure of low angle dependent SnO2 inverse opal. The response is achieved through the control of light path guided by phase transition and the significant volume change caused by the change of traditional array parameters can be effectively avoided. Meanwhile, the low angle dependent structural color of TRPC can effectively reduce the interference of observation angle change to response signal caused by external thermal stimulation. Patterned responsive photonic crystals with temperature gradient response are easily obtained by combining confinement self‐assembly and direct template method, and the patterns can be presented and hidden by the control of light path, showing great potential in anti‐counterfeiting and information encryption fields.

中文翻译:

通过控制由相变引导的光路来实现热响应光子晶体。

由于响应光子晶体的结构颜色会由于外部刺激而发生变化,因此在防伪和信息加密领域已被广泛考虑。但是,响应信号通常是根据布拉格定律随体积变化通过调整周期性晶格常数来实现的。因此,通过非阵列参数控制实现光子晶体的响应是一个巨大的挑战。在此,通过将聚乙二醇引入到低角度依赖性SnO 2结构中,制备出具有低角度依赖性结构颜色的新型热响应光子晶体(TRPC)。反蛋白石。该响应是通过控制由相变引导的光路来实现的,并且可以有效避免传统阵列参数的变化引起的显着体积变化。同时,TRPC的低角度相关结构颜色可以有效减少观测角度变化对外部热刺激引起的响应信号的干扰。通过结合限制自组装和直接模板方法,可以轻松获得具有温度梯度响应的带图案的响应光子晶体,并且可以通过控制光路来呈现和隐藏​​图案,在防伪和信息加密领域具有巨大的潜力。
更新日期:2020-08-27
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