Terahertz magnetic modulator based on magnetically clustered nanoparticles

• Published in: Applied Physics Letters (ISSN: 1077-3118), vol. 105, num. 15, p. 151108
• Publication date: 2014

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.

Reference

• EPFL-ARTICLE-206322
• doi:10.1063/1.4898095
• View record in Web of Science

Record created on 2015-03-12, modified on 2017-05-12