165903 20260119151007.0 doi 10.1117/12.2271794 sideral 104825 ART-2017-104825 eng Sanz-Felipe, A. Universidad de Zaragoza (orcid)0000-0002-2464-5626 Ferrofluids with high dynamic ranges of optical transmission 2017 Access copy available to the general public Unrestricted 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. info:eu-repo/grantAgreement/ES/MINECO/TEC2014-52642-C2-2-R info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Martín, J.C. Universidad de Zaragoza (orcid)0000-0002-8738-753X 2002 247 Universidad de Zaragoza Dpto. Física Aplicada Área Electromagnetismo 2002 647 Universidad de Zaragoza Dpto. Física Aplicada Área Óptica 10453 (2017), [6 pp] Proceedings of SPIE - The International Society for Optical Engineering 1996-756X 421309 http://zaguan.unizar.es/record/165903/files/texto_completo.pdf Postprint 2465140 http://zaguan.unizar.es/record/165903/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:165903 articulos driver 2026-01-19-15:09:27 ARTICLE