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Proceedings Paper

Ferrofluids with high dynamic ranges of optical transmission
Author(s): Á. Sanz-Felipe; J. C. Martín
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Paper Abstract

We present two ferrofluids in which high variations of optical transmission can be induced by application of moderate magnetic fields (obviously a desirable feature of functional substances aimed at photonic applications). The samples tested are representative of two different behaviors observed in ferrofluids. Exposed to a magnetic field, the size of the aggregates are much smaller in sample 1 than in sample 2, and once the magnetic field is turned off, aggregates disappear in sample 1 while they stay in sample 2. The transmission of samples 2 mm thick, as a function of magnetic field (up to 72 G), are compared. For ferrofluid 1, its transmission increases up to 40% or decreases up to 75% by applying a magnetic field perpendicular or parallel to the incident light respectively. For ferrofluid 2, the presence of a magnetic field parallel to the incident light can multiply its transmission by a factor up to 160. In both samples, the transmission dependence on the applied magnetic field shows an acceptable linearity, which is a very interesting feature face to eventual sensing applications. Besides, it is shown how aggregates favor a drastic temporal response after DC magnetic field switch on and off.

Paper Details

Date Published: 22 August 2017
PDF: 6 pages
Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 104530P (22 August 2017); doi: 10.1117/12.2271794
Show Author Affiliations
Á. Sanz-Felipe, Univ. de Zaragoza (Spain)
J. C. Martín, Univ. de Zaragoza (Spain)

Published in SPIE Proceedings Vol. 10453:
Third International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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