Nano-Photomechanical Motion of Small Particles Induced by Switching Photon Force through Photochemical Processes
Nano-Photomechanical Motion of Small Particles Induced by Switching Photon Force through Photochemical Processes
复制标题
通过光化学过程切换光子力诱导小颗粒的纳米光机械运动
DOI：
10.1117/12.2569231
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Syoji Ito; Kenji Setoura; Hiroshi Miyasaka
中科院分区：
文献类型：
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作者：
松尾健斗;渡辺裕介;田中徹;齊藤勝彦;郭其新;Syoji Ito; Kenji Setoura; Hiroshi Miyasaka
在本研究中，我们提出了一种组合（混合）的光学操纵和光化学反应的方法，实现纳米照相机械运动与小颗粒。在光化学反应方面，我们分别研究了二芳基乙烯（DAE）和吡喃喹唑啉（PQ）衍生物的P型和T型光致变色反应。含有每种光致变色化合物的单个聚合物颗粒用CW可见激光光学捕获在水中。在这个阶段，粒子主要经历梯度力，并被捕获在CW激光的焦点。吸收力可以忽略不计，因为颗粒中的大部分光致变色分子是无色形式的。紫外光照射诱导光致变色分子的光致异构化，导致有色形式的数量增加。结果，作用在颗粒上的吸收力增加，并且颗粒的位置根据实验条件向光传播方向移动。关闭UV灯后，粒子返回到原始位置。因此，被捕获的粒子进行往复运动同步的光响应的变化，由于光致变色反应。
In the present study, we propose a combined (hybrid) approach of optical manipulation and photochemical reactions for achieving nano-photomechanical motions with small particles. Aa photochemical reactions, we have employed P-type and T-type photochromic reactions of diarylethene (DAE) and pyranoquinazoline (PQ) derivatives, respectively. Single polymer particle containing each of the photochromic compounds was optically trapped in water with a CW visible laser. At this stage, the particle experienced mainly gradient force and was trapped at the focal point of the CW laser. The absorption force was negligible because most of the photochromic molecules in the particle were in the colorless form. UV exposure induced the photoisomerization of the photochromic molecules, resulting in the increase in the number of colored forms. As a result, the absorption force acting on the particle increased and, the position of the particle shifted towards the light propagation direction depending on experimental condition. After turning the UV light off, the particle went back to the original position. The trapped particle thus underwent reciprocal motion synchronizing with the change of photo-response due to the photochromic reactions.