Ferrofluids with high dynamic ranges of optical transmission

Sanz-Felipe, A. (Universidad de Zaragoza) ; Martín, J.C. (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.1117/12.2271794

Año: 2017

Publicado en: Proceedings of SPIE - The International Society for Optical Engineering 10453 (2017), [6 pp]
ISSN: 1996-756X

Financiación: info:eu-repo/grantAgreement/ES/MINECO/TEC2014-52642-C2-2-R

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Electromagnetismo (Dpto. Física Aplicada)
Área (Departamento): Área Óptica (Dpto. Física Aplicada)