Terahertz magnetic modulator based on magnetically clustered nanoparticles
Articles > Article · 2014
Authors: Mostafa SHALABY, Marco Peccianti, Yavuz ÖZTÜRK, Ibraheem AL-NAIB, Christoph P. HAURI, Roberto MORANDOTTI
APPLIED PHYSICS LETTERS, Journal Indexed in SCI Expanded, International, 2014, vol 105
DOI: 10.1063/1.4898095
Summary
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.