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Anisotropic transmission properties of magnetic fluids in the midinfrared region

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Abstract

Infrared transmission characteristics of magnetic fluids were measured in the 410μm wavelength range by using suspensions of kerosene and magnetite nanoparticles. The optical density of the magnetic fluid increased gradually toward short wavelengths, which indicated that scattering was a principal origin of the optical loss. When a magnetic field of 900G was applied in the direction perpendicular to the optical path, the optical density increased or decreased depending on whether the polarization direction of the probe beam was parallel or perpendicular to the magnetic field. By contrast, an axial magnetic field reduced the optical density for both polarizations.

© 2011 Optical Society of America

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