22 August 2017 Ferrofluids with high dynamic ranges of optical transmission
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Proceedings Volume 10453, Third International Conference on Applications of Optics and Photonics; 104530P (2017) https://doi.org/10.1117/12.2271794
Event: Third International Conference on Applications of Optics and Photonics, 2017, Faro, Portugal
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.
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Á. Sanz-Felipe, Á. Sanz-Felipe, J. C. Martín, J. C. Martín, } "Ferrofluids with high dynamic ranges of optical transmission", Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 104530P (22 August 2017); doi: 10.1117/12.2271794; https://doi.org/10.1117/12.2271794
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