000165903 001__ 165903 000165903 005__ 20260116002211.0 000165903 0247_ $$2doi$$a10.1117/12.2271794 000165903 0248_ $$2sideral$$a104825 000165903 037__ $$aART-2017-104825 000165903 041__ $$aeng 000165903 100__ $$0(orcid)0000-0002-2464-5626$$aSanz-Felipe, A.$$uUniversidad de Zaragoza 000165903 245__ $$aFerrofluids with high dynamic ranges of optical transmission 000165903 260__ $$c2017 000165903 5203_ $$aWe 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. 000165903 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/TEC2014-52642-C2-2-R 000165903 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000165903 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000165903 700__ $$0(orcid)0000-0002-8738-753X$$aMartín, J.C.$$uUniversidad de Zaragoza 000165903 7102_ $$12002$$2247$$aUniversidad de Zaragoza$$bDpto. Física Aplicada$$cÁrea Electromagnetismo 000165903 7102_ $$12002$$2647$$aUniversidad de Zaragoza$$bDpto. Física Aplicada$$cÁrea Óptica 000165903 773__ $$g10453 (2017), [6 pp]$$tProceedings of SPIE - The International Society for Optical Engineering$$x1996-756X 000165903 8564_ $$s541380$$uhttps://zaguan.unizar.es/record/165903/files/texto_completo.pdf$$yVersión publicada 000165903 8564_ $$s2684392$$uhttps://zaguan.unizar.es/record/165903/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000165903 909CO $$ooai:zaguan.unizar.es:165903$$particulos$$pdriver 000165903 951__ $$a2026-01-15-21:56:13 000165903 980__ $$aARTICLE