2 μm Tm-doped fiber laser trapping of colloidal particles by temperature gradient

Roukuya Mamuti; Takao Fuji; Tetsuhiro Kudo

doi:10.1117/12.2659039

8 December 2022 2 μm Tm-doped fiber laser trapping of colloidal particles by temperature gradient

Roukuya Mamuti, Takao Fuji, Tetsuhiro Kudo

Proceedings Volume 12479, Optical Manipulation and Structured Materials Conference (OMC 2022); 124790N (2022) https://doi.org/10.1117/12.2659039
Event: Optics and Photonics International Congress, 2022, Yokohama, Japan

Abstract

A temperature gradient induced by a focused 2 μm Tm-doped fiber laser is used for opto-thermal trapping of colloidal particles in an aqueous solution. The water has a large absorption peak around 2 μm in wavelength due to its vibrational modes, and some local temperature gradient is generated around the focus where the colloidal particles are migrated when salt is slightly added to the solution. In this study, the experimental results under different salt (electrolyte) concentrations are compared in order to clarify the role of an electrostatic force generated due to ions redistribution in the temperature gradient. As a result, the particles are trapped when the salt concentration is higher than 10 μg/ml, whereas they are not trapped under this concentration. Although a prediction of the electrostatic field near the heat source is difficult, our findings suggest that the mechanism of trapping in our system may ascribe to thermoelectric effect.

Citation Download Citation

Roukuya Mamuti, Takao Fuji, and Tetsuhiro Kudo "2 μm Tm-doped fiber laser trapping of colloidal particles by temperature gradient", Proc. SPIE 12479, Optical Manipulation and Structured Materials Conference (OMC 2022), 124790N (8 December 2022); https://doi.org/10.1117/12.2659039

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