The directional movement of an aqueous solution containing gold nanoparticles under laser irradiation (532 nm) through the vicinity of an air/water interface is reported. It is shown that unidirectional flow is generated along the path of light-travel when a laser is irradiated parallel to the interface. On the contrary, liquid flow toward the light source is caused when the incident angle of the laser is tuned so as to make the total reflection at an air/water interface. Such switching of the flow direction, positive or negative to the light propagation, was applied to the movement of mm-sized floating object, revealing that repetitive back and forth motion of the solid object is generated. This directional switching of photo-induced movement is interpreted by taking into account the flow caused by the spatial gradient of the surface tension due to the thermal effect of the incident laser. A numerical model with a Navier–Stokes-type equation reproduces the essential aspects of the switching of the direction observed in the present study.
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17 August 2020
Research Article|
August 19 2020
Switching between positive and negative movement near an air/water interface through lateral laser illumination
Mayu Shono
;
Mayu Shono
1
Faculty of Life and Medical Sciences, Doshisha University
, Kyotanabe, Kyoto 610-0394, Japan
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Satoshi Takatori
;
Satoshi Takatori
1
Faculty of Life and Medical Sciences, Doshisha University
, Kyotanabe, Kyoto 610-0394, Japan
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Jose M. Carnerero
;
Jose M. Carnerero
2
Department of Physical Chemistry, Universidad de Sevilla
, 41012 Seville, Spain
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Kenichi Yoshikawa
Kenichi Yoshikawa
a)
1
Faculty of Life and Medical Sciences, Doshisha University
, Kyotanabe, Kyoto 610-0394, Japan
3
Center for Integrative Medicine and Physics, Institute for Advanced Study, Kyoto University
, Kyoto 606-8501, Japan
a)Author to whom correspondence should be addressed: keyoshik@mail.doshisha.ac.jp
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a)Author to whom correspondence should be addressed: keyoshik@mail.doshisha.ac.jp
Appl. Phys. Lett. 117, 073701 (2020)
Article history
Received:
May 26 2020
Accepted:
August 04 2020
Citation
Mayu Shono, Satoshi Takatori, Jose M. Carnerero, Kenichi Yoshikawa; Switching between positive and negative movement near an air/water interface through lateral laser illumination. Appl. Phys. Lett. 17 August 2020; 117 (7): 073701. https://doi.org/10.1063/5.0015247
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