
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
Linhan Lin (linlh2019@mail.tsinghua.edu.cn)
Yuebing Zheng (zheng@austin.utexas.edu)
Published:2020,
Published Online:06 March 2020,
Received:26 September 2019,
Revised:06 February 2020,
Accepted:17 February 2020
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Lin, L. H. et al. Opto-thermoelectric pulling of light-absorbing particles. Light: Science & Applications, 9, 319-329 (2020).
Lin, L. H. et al. Opto-thermoelectric pulling of light-absorbing particles. Light: Science & Applications, 9, 319-329 (2020). DOI: 10.1038/s41377-020-0271-6.
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
mW μm
-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 self-induced opto-thermomechanical coupling is paving the way towards freeform optofluidic technology and lab-on-a-chip devices.
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