光机械光学器件中Nematic Liquid Crystal弹性体光机械效应机理的实验研究
Experimental Studies of the Mechanisms of Photomechanical Effects in a Nematic Liquid Crystal Elastomer in a Photomechanical Optical Device Geometry
摘要：
已知偶氮染料掺杂的液晶弹性体（LCE）显示出强的光机械响应。我们报告的实验表明，光热加热是在表面约束的几何形状的基本机制。特别是，我们使用光学干涉法来探测材料的长度变化，并直接测量温度来确定加热。使用具有各种掺杂剂和光密度的LCE来研究各个机制。在高染料掺杂极限下，大部分光在入射表面附近被吸收，这导致光热加热引起的局部应变和热扩散引起的非局部应变。光机械响应的微观机制的研究结果可以应用于设计光机械材料的致动/传感设备，智能结构的潜在基础。
英文摘要：
Azo-dye-doped liquid crystal elastomers (LCEs) are known to show a strong photomechanical response. We report on experiments that suggest that photothermal heating is the underlying mechanism in surface-constrained geometry. In particular, we use optical interferometry to probe the length change of the material and direct temperature measurements to determine heating. LCEs with various dopants and optical density were used to study the individual mechanisms. In the high dye-doped limit, most of the light is absorbed near the entry surface, which causes a local strain from photothermal heating and a nonlocal strain from thermal diffusion. The results of our research on the microscopic mechanisms of the photomechanical response can be applied to designing photomechanical materials for actuating/sensing devices, the potential basis of smart structures.
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