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Nano Research 2021, 14(1): 295-303 https://doi.org/10.1007/s12274-020-3087-z
Research Article | Issue | Published: 05 January 2021

Atomistic modeling and rational design of optothermal tweezers for targeted applications

Show Author's Information Hongru Ding1,  Pavana Siddhartha Kollipara1,  Linhan Lin2( ),  Yuebing Zheng1,3( )
Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA
Keywords:
molecular dynamics simulation, thermophoresis, optothermal tweezers, optical tweezers, optical manipulation
Topics:
Optical tweezers
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Ding H, Kollipara PS, Lin L, et al. Atomistic modeling and rational design of optothermal tweezers for targeted applications. Nano Research, 2021, 14(1): 295-303. https://doi.org/10.1007/s12274-020-3087-z
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Abstract Full text Electronic supplementary material About this article

Optical manipulation of micro/nanoscale objects is of importance in life sciences, colloidal science, and nanotechnology. Optothermal tweezers exhibit superior manipulation capability at low optical intensity. However, our implicit understanding of the working mechanism has limited the further applications and innovations of optothermal tweezers. Herein, we present an atomistic view of opto-thermo-electro-mechanic coupling in optothermal tweezers, which enables us to rationally design the tweezers for optimum performance in targeted applications. Specifically, we have revealed that the non-uniform temperature distribution induces water polarization and charge separation, which creates the thermoelectric field dominating the optothermal trapping. We further design experiments to systematically verify our atomistic simulations. Guided by our new model, we develop new types of optothermal tweezers of high performance using low-concentrated electrolytes. Moreover, we demonstrate the use of new tweezers in opto-thermophoretic separation of colloidal particles of the same size based on the difference in their surface charge, which has been challenging for conventional optical tweezers. With the atomistic understanding that enables the performance optimization and function expansion, optothermal tweezers will further their impacts.


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Electronic supplementary material
About this article

Atomistic modeling and rational design of optothermal tweezers for targeted applications

Show Author's information Hongru Ding1, Pavana Siddhartha Kollipara1, Linhan Lin2( ), Yuebing Zheng1,3( )
Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA

Abstract

Optical manipulation of micro/nanoscale objects is of importance in life sciences, colloidal science, and nanotechnology. Optothermal tweezers exhibit superior manipulation capability at low optical intensity. However, our implicit understanding of the working mechanism has limited the further applications and innovations of optothermal tweezers. Herein, we present an atomistic view of opto-thermo-electro-mechanic coupling in optothermal tweezers, which enables us to rationally design the tweezers for optimum performance in targeted applications. Specifically, we have revealed that the non-uniform temperature distribution induces water polarization and charge separation, which creates the thermoelectric field dominating the optothermal trapping. We further design experiments to systematically verify our atomistic simulations. Guided by our new model, we develop new types of optothermal tweezers of high performance using low-concentrated electrolytes. Moreover, we demonstrate the use of new tweezers in opto-thermophoretic separation of colloidal particles of the same size based on the difference in their surface charge, which has been challenging for conventional optical tweezers. With the atomistic understanding that enables the performance optimization and function expansion, optothermal tweezers will further their impacts.

Keywords: molecular dynamics simulation, thermophoresis, optothermal tweezers, optical tweezers, optical manipulation

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Publication history
Copyright
Acknowledgements

Publication history

Received: 22 June 2020
Revised: 22 August 2020
Accepted: 03 September 2020
Published: 05 January 2021
Issue date: January 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

The authors acknowledge the financial support of the National Science Foundation (No. NSF-CMMI-1761743), the National Aeronautics and Space Administration Early Career Faculty Award (No. 80NSSC17K0520), and the National Institute of General Medical Sciences of the National Institutes of Health (No. DP2GM128446). L. H. L. acknowledges financial support from the National Natural Science Foundation of China (No. 62075111) and the State Key Laboratory of Precision Measurement Technology and Instruments. The authors are grateful to Prof. Brian A. Korgel and Dr. Taizhi Jiang for providing Si particles. They also thank Yaoran Liu, Jingang Li, Kan Yao and Zhihan Chen for useful discussions.

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