Growth and decay dynamics of a stable microbubble produced at the end of a near-field scanning optical microscopy fiber probe

Autor:	Roderick S. Taylor, Cyril Hnatovsky
Rok vydání:	2004
Předmět:	Microheater Range (particle radiation) Materials science business.industry Bubble General Physics and Astronomy Radiation law.invention Physics::Fluid Dynamics Optics Optical microscope law Phase (matter) Near-field scanning optical microscope Laser power scaling business
Zdroj:	Journal of Applied Physics. 95:8444-8449
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1751631
Popis:	Low power cw laser radiation coupled into a near-field scanning optical microscopy fiber probe has been used to generate a stable microbubble in water. A probe tip which was selectively chemically etched and metallized served as a microheater for the generation of the stable bubble. Bubble diameters in the range of 40–400 μm and lifetimes of over an hour have been obtained. The microbubble exhibited a linear growth phase over a period of a few seconds before reaching a maximum diameter which depended on the laser power. When the laser beam was blocked the microbubble decayed with a rate which was inversely proportional to the bubble diameter. The bubble lifetime depended on the square of the initial bubble diameter. Instabilities which transform a large stable bubble into a microjet stream of micron sized bubbles as the laser power was increased is also described.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06b04bb2bca044338fc8a40fa7888fa9 https://doi.org/10.1063/1.1751631 Zobrazit plný text záznamu