Controllable generation and manipulation of micro-bubbles in water with absorptive colloid particles by CW laser radiation

Publication: Research - peer-reviewJournal article – Annual report year: 2017

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Micrometer-sized vapor-gas bubbles are formed due to local heating of a water suspension containing absorptive pigment particles of 100 nm diameter. The heating is performed by CW near-infrared (980 nm) laser radiation with controllable power, focused into a 100 mu m spot within a 2 mm suspension layer. By changing the laser power, four regimes are realized: (1) bubble generation; (2) stable growth of the existing bubbles; (3) stationary existence of the bubbles and (4) the bubbles' shrinkage and collapse. This behavior is interpreted based on the temperature conditions. The generation and evolution of single bubbles and ensembles of bubbles with controllable sizes and numbers is demonstrated. The bubbles are grouped within the laser-illuminated region and form quasi-ordered structures. They can easily be moved and transported controlled by the focal spot. The results are useful for applications associated with the precise manipulation, sorting and specific delivery in nano- and micro-engineering problems. (C) 2017 Optical Society of America
Original languageEnglish
JournalOptics Express
Volume25
Issue number5
Pages (from-to)5232-5243
ISSN1094-4087
DOIs
StatePublished - 2017
CitationsWeb of Science® Times Cited: 23

    Keywords

  • Atomic and Molecular Physics, and Optics, Continuous wave lasers, Infrared devices, Laser radiation, Colloid particles, Controllable size, Micro engineering, Ordered structures, Pigment particles, Precise manipulation, Temperature conditions, Water suspensions, Suspensions (fluids), OPTICS, PLASMONIC NANOPARTICLES, GAS-BUBBLES
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