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3D trapping of microbubbles by the Marangoni force

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Abstract

In this Letter, we show 3D steady-state trapping and manipulation of vapor bubbles in liquids employing a low-power continuous-wave laser using the Marangoni effect. Light absorption from photodeposited silver nanoparticles on the distal end of a multi-mode optical fiber is used to produce bubbles of different diameters. The thermal effects produced by either the nanoparticles on the fiber tip or the light bulk absorption modulate the surface tension of the bubble wall and creates both longitudinal and transversal forces just like optical forces, effectively creating a 3D potential well. Using numerical simulations, we obtain expressions for the temperature profiles and present analytical expressions for the Marangoni force. In addition, using an array of three fibers with photodeposited nanoparticles is used to demonstrate the transfer of bubbles from one fiber to another by sequentially switching on and off the lasers.

© 2021 Optical Society of America

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Supplementary Material (2)

NameDescription
Visualization 1       3D trapping and manipulation of a bubble of radius R = 50 µm, at 1550 nm and 15 mW.
Visualization 2       Trapping and manipulation of a microbubble of R = 100 µm by optothermal effects induced at a different wavelength with low optical powers.

Data Availability

Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (5)

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Equations (8)

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