Opto-thermoelectric pulling of light-absorbing particles  

作　　者：Linhan Lin Pavana Siddhartha Kollipara Abhay Kotnala Taizhi Jiang Yaoran Liu Xiaolei Peng Brian A.Korgel Yuebing Zheng 

机构地区：[1]Walker Department of Mechanical Engineering,The University of Texas at Austin,Austin,TX 78712,USA [2]Materials Science&Engineering Program and Texas Materials Institute,The University of Texas at Austin,Austin,TX 78712,USA [3]State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instrument,Tsinghua University,Beijing 100084,People’s Republic of China [4]McKetta Department of Chemical Engineering,The University of Texas at Austin,Austin,TX 78712,USA [5]Department of Electrical and Computer Engineering,The University of Texas at Austin,Austin,TX 78712,USA

出　　处：《Light(Science & Applications)》2020年第1期1686-1696,共11页光（科学与应用)（英文版）

基　　金：the financial support of the National Science Foundation(NSF-CMMI-1761743);the Army Research Office(W911NF-17-1-0561);the National Aeronautics and Space Administration Early Career Faculty Award(80NSSC17K0520);the National Institute of General Medical Sciences of the National Institutes of Health(DP2GM128446);financial support of this work from the Robert A.Welch Foundation(Grant no.F-1464);the National Science Foundation through the Center for Dynamics and Control of Materials:an NSF MRSEC under Cooperative Agreement No.DMR-1720595;support from the Youth Thousand Talent Programme of China.

摘　　要：Optomechanics arises from the photon momentum and its exchange with low-dimensional objects.It is well known that optical radiation exerts pressure on objects,pushing them along the light path.However,optical pulling of an object against the light path is still a counter-intuitive phenomenon.Herein,we present a general concept of optical pulling-opto-thermoelectric pulling(OTEP)—where the optical heating of a light-absorbing particle using a simple plane wave can pull the particle itself against the light path.This irradiation orientation-directed pulling force imparts self-restoring behaviour to the particles,and three-dimensional(3D)trapping of single particles is achieved at an extremely low optical intensity of 10^(−2)mWμm^(−2).Moreover,the OTEP force can overcome the short trapping range of conventional optical tweezers and optically drive the particle flow up to a macroscopic distance.The concept of selfinduced opto-thermomechanical coupling is paving the way towards freeform optofluidic technology and lab-on-achip devices.

关 键 词：absorbing LIGHT TRAPPING 

分 类 号：O43[机械工程—光学工程]