Opto-thermoelectric microswimmers

Xiaolei Peng; Zhihan Chen; Pavana Siddhartha Kollipara; Yaoran Liu; Jie Fang; Linhan Lin; Yuebing Zheng

doi:10.1038/s41377-020-00378-5

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Opto-thermoelectric microswimmers

Article

- Opto-thermoelectric microswimmers
- Opto-thermoelectric microswimmers
- LSA 2020年9卷第5期页码：1380-1391
- Affiliations：
  
  1.Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA
  2.Walker Department of Mechanical Engineering, 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
- Author bio：
  
  Linhan Lin (linlh2019@mail.tsinghua.edu.cn)
  Yuebing Zheng (zheng@austin.utexas.edu)
- Funds：
- DOI：10.1038/s41377-020-00378-5
  中图分类号：
- 纸质出版日期：2020，
  
  网络出版日期：2020-08-17，
  
  收稿日期：2020-04-06，
  
  修回日期：2020-07-29，
  
  录用日期：2020-08-03
- Accepted：
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Opto-thermoelectric microswimmers[J]. LSA, 2020,9(5):1380-1391.

Peng, X. L. et al. Opto-thermoelectric microswimmers. Light: Science & Applications, 9, 1380-1391 (2020).
Opto-thermoelectric microswimmers[J]. LSA, 2020,9(5):1380-1391. DOI： 10.1038/s41377-020-00378-5.

Peng, X. L. et al. Opto-thermoelectric microswimmers. Light: Science & Applications, 9, 1380-1391 (2020). DOI： 10.1038/s41377-020-00378-5.

摘要

Abstract

Inspired by the "run-and-tumble" behaviours of Escherichia coli (

E. coli

) cells

we develop opto-thermoelectric microswimmers. The microswimmers are based on dielectric-Au Janus particles driven by a self-sustained electrical field that arises from the asymmetri

c optothermal response of the particles. Upon illumination by a defocused laser beam

the Janus particles exhibit an optically generated temperature gradient along the particle surfaces

leading to an opto-thermoelectrical field that propels the particles. We further discover that the swimming direction is determined by the particle orientation. To enable navigation of the swimmers

we propose a new optomechanical approach to drive the in-plane rotation of Janus particles under a temperature-gradient-induced electrical field using a focused laser beam. Timing the rotation laser beam allows us to position the particles at any desired orientation and thus to actively control the swimming direction with high efficiency. By incorporating dark-field optical imaging and a feedback control algorithm

we achieve automated propelling and navigation of the microswimmers. Our opto-thermoelectric microswimmers could find applications in the study of opto-thermoelectrical coupling in dynamic colloidal systems

active matter

biomedical sensing

and targeted drug delivery.

关键词

Keywords

references

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