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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