Thermoplasmonics for investigation of microbubble dynamics in degassed water
Thermoplasmonics for investigation of microbubble dynamics in degassed water
复制标题
DOI：
10.1117/12.2528560
复制
发表时间：
2019-09
期刊：
影响因子：
--
通讯作者：
K. Namura;Y. Shimada;S. Okai;Samir Kumar;Motofumi Suzuki
中科院分区：
文献类型：
--
作者：
K. Namura;Y. Shimada;S. Okai;Samir Kumar;Motofumi Suzuki
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.
