- By:
- Narihira, Kyoshiro; Fukuhara, Seiji; Yasuda, Naoki; Fujii, Keisuke ; Namura, Kyoko; Suzuki, Motofumi
- Page Number:
- 1370307
- Volume:
- 13703
- Book Title:
- Optical Manipulation and Structured Materials Conference 2025
- Publication Date:
- March 12, 2026
- Publisher Location:
- SPIE, Washington, United States of America
- Conference Name:
- Optics and Photonics International Congress
- Conference Location:
- Yokohama, Japan
- Conference Sponsor:
- SPIE
- View DOI Listing:
- https://doi.org/10.1117/12.3072255
Abstract
We measured water temperature around a self-oscillating water vapor-rich bubble using diffraction phase microscopy equipped with a pulsed laser. The water vapor-rich bubble, which causes a strong water flow around it, was generated by locally heating degassed water through the photothermal conversion properties of an FeSi2 thin film. The generation of the flow is related to the self-oscillation of the bubble at sub-MHz frequencies and the temperature distribution around it. Here, the refractive index of the surrounding water was measured using a pulsed laser with a 3.5-ns pulse duration, which guarantees a time resolution of less than 1/200 of the oscillation cycle of the bubble. The temperature distribution around the bubble was calculated from the measured refractive index.
