Generation of water vapor microbubbles on optical fiber tips

Kyoko Namura; Tasuku Okuno; Motofumi Suzuki

doi:10.1117/12.3008367

20 September 2023 Generation of water vapor microbubbles on optical fiber tips

Kyoko Namura, Tasuku Okuno, Motofumi Suzuki

Proceedings Volume 12606, Optical Manipulation and Structured Materials Conference; 1260616 (2023) https://doi.org/10.1117/12.3008367
Event: Optics and Photonics International Congress, 2023, Yokohama, Japan

Abstract

Local heating of degassed water produces a water vapor microbubble and significant flow around it. However, this flow is strongly attenuated by the substrate on which the bubble is generated. The flow speed is proportional to the -3 power of the distance from the bubble. In this study, the bubble was generated using a thin, tapered optical fiber. The FeSi₂ thin film was deposited on the fiber tip to heat the fiber tip using the photothermal conversion property of the film. As a result, a water vapor microbubble was generated on the fiber tip with a diameter of 28 μm. The flow speed around the bubbles was proportional to the -1.2 power of the distance from the bubbles. It exceeded 80 mm/s even at 200 μm away from the bubble.

Citation Download Citation

Kyoko Namura, Tasuku Okuno, and Motofumi Suzuki "Generation of water vapor microbubbles on optical fiber tips", Proc. SPIE 12606, Optical Manipulation and Structured Materials Conference, 1260616 (20 September 2023); https://doi.org/10.1117/12.3008367

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