Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4898095
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Random orientation of liquid-suspended magnetic nanoparticles (Ferrofluids) gives rise to a zero net magnetic orientation. An external magnetic field tends to align these nanoparticles into clusters, leading to a strong linear dichroism on a propagating wave. Using 10 nm-sized Fe3O4, we experimentally realize a polarization-sensitive magnetic modulator operating at terahertz wavelengths. We reached a modulation depth of 66% using a field as low as 35 mT. The proposed concept offers a solution towards fundamental terahertz magnetic modulators. (C) 2014 AIP Publishing LLC.
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