报告题目:Controlling Cell Motion and Microscale Flow with Polarized Light Fields

报告时间:9月23日(周五)下午14:30

报告人:张何朋 教授(上海交通大学)

邀请人:肖克

腾讯会议:513-110-107


简历:张何朋2000年毕业于复旦大学物理系,2004年在美国纽约城市大学获得博士学位。2004年8月到美国得克萨斯大学奥斯丁分校从事研究工作。2010年加入上海交通大学自然科学研究院和物理与天文学院。关注软物质和生物物理系统中的多尺度、非平衡动力学问题;已经美国科学院院刊(PNAS)、物理评论快报(PRL)等国际学术刊物发表论文四十余篇,在多个国际学术会议上做邀请报告,主持多项国家和上海市的科研和人才项目。

简介:We investigate how light polarization affects the motion ofphoto responsive algae, Euglena gracilis. In a uniformlypolarized field, cells swim approximately perpendicular to thepolarization direction and form a nematic state with zero meanvelocity. When light polarization varies spatially, cell motion ismodulated by local polarization. In such light fields, cells exhibitcomplex spatial distribution and motion patterns which arecontrolled by topological properties of the underlying fields; wefurther show that ordered cell swimming can generate directedtransporting fluid flow. Experimental results are quantitativelyreproduced by an active Brownian particle model in whichparticle motion direction is nematically coupled to local lightpolarization.

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