Hernández Raúl Josué, Sevilla Francisco J, Mazzulla Alfredo, Pagliusi Pasquale, Pellizzi Nicola, Cipparrone Gabriella
Cátedra CONACYT Consejo Nacional de Ciencia y Tecnología - Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apdo. Postal 70-543, 04510 Cd. de México, Mexico.
Soft Matter. 2020 Sep 7;16(33):7704-7714. doi: 10.1039/c9sm02404b. Epub 2020 Jul 31.
We demonstrate the emergence of circular collective motion in a system of spherical light-propelled Brownian particles. Light-propulsion occurs as consequence of the coupling between the chirality of polymeric particles - left (L)- or right (R)-type - and the circularly-polarized light that irradiates them. Irradiation with light that has the same helicity as the particle material leads to a circular cooperative vortical motion between the chiral Brownian particles. In contrast, opposite circular-polarization does not induce such coupling among the particles but only affects their Brownian motion. The mean angular momentum of each particle has a value and sign that distinguishes between chiral activity dynamics and typical Brownian motion. These outcomes have relevant implications for chiral separation technologies and provide new strategies for optical torque tunability in mesoscopic optical array systems, micro- and nanofabrication of light-activated engines with selective control and collective motion.
我们展示了在球形光驱动布朗粒子系统中圆形集体运动的出现。光驱动是聚合物粒子（左旋（L）或右旋（R）型）的手性与照射它们的圆偏振光之间耦合的结果。用与粒子材料具有相同螺旋度的光照射会导致手性布朗粒子之间的圆形协同涡旋运动。相比之下，相反的圆偏振不会在粒子之间诱导这种耦合，而只会影响它们的布朗运动。每个粒子的平均角动量具有区分手性活性动力学和典型布朗运动的值和符号。这些结果对手性分离技术具有重要意义，并为介观光学阵列系统中的光学扭矩可调性、具有选择性控制和集体运动的光激活发动机的微纳制造提供了新策略。
