Terahertz magnetic modulator based on magnetically clustered nanoparticles

SHALABY M., Peccianti M., Ozturk Y. , AL-NAIB I., HAURI C. P. , MORANDOTTI R.

APPLIED PHYSICS LETTERS, cilt.105, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 105 Konu: 15
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1063/1.4898095


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.