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Proceedings Paper

Light induced particle organization in paramagnetic fluids
Author(s): Marcin Bacia; Jan Masajada; Sławomir Drobczyński; Weronika Lamperska; Joanna Kutrowska; Katarzyna Walczak
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Paper Abstract

Magnetic fluids (ferrofluids) consist of magnetic nanoparticles (diameter ~10nm) which are dispersed in a liquid, often with the use of surfactants. They were first developed by NASA to address the unique requirements of moving liquid fuel in microgravity conditions. With a help of a holographic optical tweezers, interaction of magnetic nanoparticles with strongly focused laser beam was observed. When the light intensity was high enough, magnetic nanoparticles were removed from the beam center and they formed a dark ring. Creation process lasts less than 330μs and cannot be observed precisely even with ultrafast camera. Such rings exist when the laser beam is affecting the sample and disappear (with a lifespan of 10’th second range) after the laser is switched off. Moreover, when several rings are created simultaneously, complex interactions between them can be observed. In this work, the results of our experiments will be presented with hypotheses about the physical background of such a behavior.

Paper Details

Date Published: 5 December 2014
PDF: 12 pages
Proc. SPIE 9441, 19th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 944109 (5 December 2014); doi: 10.1117/12.2074726
Show Author Affiliations
Marcin Bacia, Wrocław Univ. of Technology (Poland)
Jan Masajada, Wrocław Univ. of Technology (Poland)
Sławomir Drobczyński, Wrocław Univ. of Technology (Poland)
Weronika Lamperska, Wrocław Univ. of Technology (Poland)
Joanna Kutrowska, Wrocław Univ. of Technology (Poland)
Katarzyna Walczak, Wrocław Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 9441:
19th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Agnieszka Popiolek-Masajada; Waclaw Urbanczyk, Editor(s)

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