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9 September 2019 Thermoplasmonics for investigation of microbubble dynamics in degassed water
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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.
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Kyoko Namura, Yusaku Shimada, Shunsuke Okai, Samir Kumar, and Motofumi Suzuki "Thermoplasmonics for investigation of microbubble dynamics in degassed water", Proc. SPIE 11082, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII, 110820S (9 September 2019);

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