Generation, 3D trapping, and self-oscillation microbubbles

J. M. Pérez-Corte; J. A. Sarabia-Alonso; J. G. Ortega-Mendoza; K. Ortega-Sánchez; R. Ramos-García

doi:10.1117/12.2676019

5 October 2023 Generation, 3D trapping, and self-oscillation microbubbles

J. M. Pérez-Corte, J. A. Sarabia-Alonso, J. G. Ortega-Mendoza, K. Ortega-Sánchez, R. Ramos-García

Proceedings Volume 12649, Optical Trapping and Optical Micromanipulation XX; 126490I (2023) https://doi.org/10.1117/12.2676019
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

In this study, the controlled formation, trapping, and self-oscillation of vapor microbubbles in ethanol was investigated using low-power continuous wave (CW) lasers. The formation of these microbubbles is achieved by evaporation of ethanol due to heating by light absorption (CW laser emitting at λ = 658 nm) in silver nanoparticles deposited at the distal end of a multimode optical fiber. A second low-power NIR laser (λ = 1,550 nm) coupled to a single-mode optical fiber is then used to trap the microbubbles. It has been shown that the bulk absorption of light at 1,550 nm in ethanol modulates the surface tension of the bubble wall, creating a three-dimensional potential well that efficiently traps the bubbles. Furthermore, it was observed that once the bubble is trapped, random variations in its radius create instabilities in the trap, resulting in microbubble oscillations. The trapped bubble tends to oscillate between two quasi-stationary equilibrium points along the propagation of light. These oscillations are the result of competition between several forces, such as the Marangoni, the upward of buoyancy, and the drag forces. The results presented in this work contribute significantly to the understanding of these phenomena and may have important applications in fields such as microfluidics and bubble manipulation.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

J. M. Pérez-Corte, J. A. Sarabia-Alonso, J. G. Ortega-Mendoza, K. Ortega-Sánchez, and R. Ramos-García "Generation, 3D trapping, and self-oscillation microbubbles", Proc. SPIE 12649, Optical Trapping and Optical Micromanipulation XX, 126490I (5 October 2023); https://doi.org/10.1117/12.2676019

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