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3D manipulation of microbubbles by laser-induced thermal gradients
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Paper Abstract

We present the generation and 3D manipulation of microbubbles by thermal gradients, induced by low power nanosecond pulsed laser in non-absorbent liquids. Light absorption at photodeposited silver nanoparticles on the optical fiber tip heat up the surrounding liquid, which leads to optothermal effects. With each laser pulse a microbubble is detached from the optical fiber end, creating a microbubbles-stream. The microbubbles move away from the optical fiber end driven by non-spherical cavitation until they coalesce creating a main-bubble which is attracted towards the optical fiber end by Marangoni force. In addition, the main-bubbles are under the influence of buoyancy and gravity forces, which act upwards and downwards, respectively. The balance of these forces allows the 3D manipulation of the main-bubble. The main-bubble position can be controlled by careful control of the pulse energy. To our knowledge this is the first time that 3D manipulation of microbubbles using pulsed lasers is demonstrated.

Paper Details

Date Published: 9 September 2019
PDF: 7 pages
Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110832X (9 September 2019); doi: 10.1117/12.2528549
Show Author Affiliations
J. A. Sarabia-Alonso, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
J. O. Ortega-Mendoza, Univ. Politécnica de Tulancingo (Mexico)
J. C. Ramírez-San-Juan, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
P. Zaca-Morán, Benemérita Univ. Autónoma de Puebla (Mexico)
A. Padilla-Vivanco, Univ. Politécnica de Tulancingo (Mexico)
J. Ramírez-Ramírez, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
R. Ramos-García, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)


Published in SPIE Proceedings Vol. 11083:
Optical Trapping and Optical Micromanipulation XVI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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