Optical manipulation of macroscopic curved objects  

作　　者：Gui-hua Chen Mu-ying Wu Yong-qing Li 

机构地区：[1]School of Electronic Engineering&Intelligentization,Dongguan University of Technology,Dongguan 523808,China [2]Institute of Science&Technology Innovation,Dongguan University of Technology,Dongguan 523808,China [3]Department of Physics,East Carolina University,Greenville,North Carolina 27858-4353,USA

出　　处：《Frontiers of physics》2025年第1期263-268,共6页物理学前沿(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.61775036);the high-level talents program of Dongguan University of Technology(Grant No.KCYCXPT2017003).

摘　　要：Laser has become a powerful tool to manipulate micro-particles and atoms by radiation pressure or photophoretic force,but its effectiveness for large objects is less noticeable.Here,we report the direct observation of unusual light-induced attractive forces that allow manipulating centimeter-sized curved absorbing objects by a light beam.This force is attributed to the radiometric effect caused by the curvature of the vane and its magnitude and temporal responses are directly measured with a pendulum.Simulations suggest that the force arises from the bending of the vane,which results in a temperature difference of gas molecules between the concave and convex sides due to unbalanced gas convection.This large force(~4.4μN)is sufficient to rotate a motor with four curved vanes at speeds up to 600 r/min and even lifting a large vane.Manipulating macroscopic objects by light could have significant applications for solar radiationpowered near-space propulsion systems and for understanding the mechanisms of negative photophoretic forces.

关 键 词：optical manipulation radiometric force geometry effect unbalanced gas convection 

分 类 号：O17[理学—数学]