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Thermo-, photo-, and mechano-responsive liquid crystal networks enable tunable photonic crystals
Soft Matter ( IF 3.4 ) Pub Date : 2017-08-30 00:00:00 , DOI: 10.1039/c7sm01287j
N. Akamatsu 1, 2, 3, 4, 5 , K. Hisano 1, 2, 3, 4, 5 , R. Tatsumi 1, 2, 3, 4, 5 , M. Aizawa 1, 2, 3, 4, 5 , C. J. Barrett 1, 2, 3, 4, 5 , A. Shishido 1, 2, 3, 4, 5
Affiliation  

Tunable photonic crystals exhibiting optical properties that respond reversibly to external stimuli have been developed using liquid crystal networks (LCNs) and liquid crystal elastomers (LCEs). These tunable photonic crystals possess an inverse opal structure and are photo-responsive, but circumvent the usual requirement to contain dye molecules in the structure that often limit their applicability and cause optical degradation. Herein, we report tunable photonic crystal films that reversibly tune the reflection peak wavelength under thermo-, photo- and mechano-stimuli, through bilayering a stimuli-responsive LCN including azobenzene units with a colourless inverse opal film composed of non-responsive, flexible durable polymers. By mechanically deforming the azobenzene containing LCN via various stimuli, the reflection peak wavelength from the bilayered film assembly could be shifted on demand. We confirm that the reflection peak shift occurs due to the deformation of the stimuli-responsive layer propagating towards and into the inverse opal layer to change its shape in response, and this shift behaviour is repeatable without optical degradation.

中文翻译:

热响应,光响应和机械响应的液晶网络可实现可调光子晶体

使用液晶网络(LCN)和液晶弹性体(LCE)已开发出可调谐的光子晶体,该晶体具有对外部刺激可逆地响应的光学特性。这些可调谐的光子晶体具有反蛋白石结构并且具有光响应性,但避开了通常要求在结构中包含染料分子的问题,而染料分子通常会限制其适用性并导致光学降解。本文中,我们报告了可调谐光子晶体薄膜,该薄膜通过将包含偶氮苯单元的刺激响应性LCN与无反应性,柔性耐用的无色反蛋白石膜双层化,可逆地调节热,光和机械刺激下的反射峰波长。聚合物。通过含有LCN偶氮苯机械变形经由在各种刺激下,双层膜组件的反射峰值波长可以按需移动。我们确认反射峰移动是由于刺激响应层向和进入反蛋白石层传播而变形以响应其形状而发生的,并且这种移动行为是可重复的,不会造成光学性能下降。
更新日期:2017-09-13
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