Photothermal convection has been a major obstacle for stable particle trapping in plasmonic optical tweezer at high optical power. Here, we demonstrate a strategy to suppress the plasmonic photothermal convection by using vanishingly small thermal expansion coefficient of water at low temperature. A simple square nanoplasmonic array is illuminated with a loosely Gaussian beam to produce a two dimensional optical lattice for trapping of micro particles. We observe stable particle trapping due to near-field optical gradient forces at elevated optical power at low temperature. In contrast, for the same optical power at room temperature, the particles are convected away from the center of the optical lattice without their accumulation. This technique will greatly increase usable optical power and enhance the trapping capability of plasmonic optical tweezer.
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14 November 2016
Research Article|
November 18 2016
Suppression of photothermal convection of microparticles in two dimensional nanoplasmonic optical lattice
Yi-Chung Chen;
Yi-Chung Chen
1Department of Electrical Engineering,
National Tsing Hua University
, Hsinchu 30013, Taiwan
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Gilad Yossifon;
Gilad Yossifon
2Faculty of Mechanical Engineering,
Technion-Israel Institute of Technology
, Technion City 32000, Israel
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Ya-Tang Yang
Ya-Tang Yang
a)
1Department of Electrical Engineering,
National Tsing Hua University
, Hsinchu 30013, Taiwan
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
Appl. Phys. Lett. 109, 201111 (2016)
Article history
Received:
July 28 2016
Accepted:
November 03 2016
Citation
Yi-Chung Chen, Gilad Yossifon, Ya-Tang Yang; Suppression of photothermal convection of microparticles in two dimensional nanoplasmonic optical lattice. Appl. Phys. Lett. 14 November 2016; 109 (20): 201111. https://doi.org/10.1063/1.4967882
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