论文标题
散落激光陷阱中活性胶体物质的选择热演化
Optothermal evolution of active colloidal matter in defocused laser trap
论文作者
论文摘要
主动胶体物质的选择热相互作用可以促进环境线索，从而影响活性软物质系统的动态。可以利用光学诱导的热效应研究非平衡热力学，并应用于自动胶体和形成组件。在这项工作中，我们采用了一个散焦的激光陷阱来形成自我发展的胶体活跃物质。已经研究了聚焦和散落的光学陷阱中活性胶体的选择热相互作用，以确定其嗜热行为，这显示了胶体之间的远距离吸引力和短期排斥。光学梯度场启用了吸引力和活性胶体之间的短距离排斥力已被利用以形成可重新配置的动态组件。此外，当新胶体加入结构时，组装也经历了自我进化。此外，我们表明光场的入射极化状态可以用作调节活性胶体的结构取向的参数。简单的供电型光场启用组件可以用作了解活动物质系统的集体动态的模型，并且可以作为可重新配置的显微镜发动机来利用。
Optothermal interaction of active colloidal matter can facilitate environmental cues which can influence the dynamics of active soft matter systems. The optically induced thermal effect can be harnessed to study non-equilibrium thermodynamics as well as applied to self-propel colloids and form assemblies. In this work, we employ a defocused laser trap to form self-evolving colloidal active matter. The optothermal interaction of the active colloids in both focused and defocused optical trap has been investigated to ascertain their thermophoretic behavior, which shows a long-range attraction and a short-range repulsion between the colloids. The optical gradient field enabled attraction and the short-range repulsion between the active colloids have been harnessed to form re-configurable dynamic assembly. Additionally, the assembly undergoes self-evolution as a new colloid joins the structure. Further, we show that the incident polarization state of the optical field can be employed as a parameter to modulate the structural orientation of the active colloids. The simple defocused optical field-enabled assembly can serve as a model to understand the collective dynamics of active matter systems, and can be harnessed as re-configurable microscopic engine.
