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Proceedings Paper

Thermoplasmonics for investigation of microbubble dynamics in degassed water
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Paper Abstract

We experimentally investigated the oscillation of the water vapor microbubble generated in degassed water using thermoplasmonic effect. A CW laser was focused on a gold nanoisland film to realize localized thermoplasmonic heating of the degassed water and subsequent generation of a water vapor microbubble. The generated bubble was found to be oscillating at 0.5{1 MHz although the laser power was constant. When the laser spot size, namely, the heating spot size, was fixed to 2.7 μm, the bubble diameter and the oscillation frequency was almost independent on the laser power. On the other hand, the bubble size significantly increased as the laser spot size increases from 2.8 to 3.7 μm. Besides, the oscillation frequency decreased as the bubble size increased, which was the same order of magnitude as the bubble resonance frequency. These results suggest that the behavior of the water vapor microbubble is highly dependent on the outmost region of the laser spot, to which the bubble contacts periodically.

Paper Details

Date Published: 9 September 2019
PDF: 7 pages
Proc. SPIE 11082, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII, 110820S (9 September 2019);
Show Author Affiliations
Kyoko Namura, Kyoto Univ. (Japan)
Yusaku Shimada, Kyoto Univ. (Japan)
Shunsuke Okai, Kyoto Univ. (Japan)
Samir Kumar, Kyoto Univ. (Japan)
Motofumi Suzuki, Kyoto Univ. (Japan)


Published in SPIE Proceedings Vol. 11082:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII
Din Ping Tsai; Takuo Tanaka, Editor(s)

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