Refractive index of Bidispersed ferrofluid (BDF) changes with the external magnetic field during light transport. BDF is the most appropriate “liquid magnet” for the magnetic modulation. BDF is composed of micrometer-sized magnetic sphere dispersed in a magnetic nanofluid consisting of magnetic nanoparticles in a non-magnetic liquid carrier. The variation in the relative refractive index (RRI) of BDF was studied as a function of external magnetic field. RRI increases with external magnetic field and saturates. Probability of such behavior of RRI is extinction of light. Probable reason of extinction like Mie resonance, optical limiting, and magnetic-hole theory is discussed. The study gives better insight about the role of RRI in extinction of light for BDF, which is governing factor in light.
Magnetic fluid Refractive index Mie resonance Optical limiting
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Haes J, Van Duyne RP (2002) A nanooptical biosensor: sensitivity of an approach based on the localised surface plasmons resonance spectroscopy of triangle silver nanoparticles. J Am Chem Soc 124:10596–10604CrossRefGoogle Scholar
Engheta N (2007) Circuits with light at nanoscale: Optical nanocircuits inspired by metamaterials. Science 317:1698–1702CrossRefGoogle Scholar
Khatsuriya KG, Bhatt H (2015) Temperature and size dependence of structural anisotropy in presence of magnetic field—a study to control light transport. In: International conference on NANO-15Google Scholar
Bhatt H, Patel R (2013) Optical transport in bidispersed magnetic colloids with varying refractive index. J Nanofluid 2:188–193CrossRefGoogle Scholar
Philip J, Laskar JM (2012) Optical properties and applications of ferrofluid—a review. J Nanofluid 1:3–20CrossRefGoogle Scholar