Terahertz magnetic modulator based on magnetically clustered nanoparticles
Research Area: THz Linear and Nonlinear Phenomena Year: 2014
Type of Publication: Article Keywords: terahertz, magnetism, modulation
  • Mostafa Shalaby
  • Marco Peccianti
  • Yavuz Ozturk
  • Ibraheem Al-Naib
  • Christoph P. Hauri,
  • Roberto Morandotti
Journal: Type of Publication: Volume: 105
Number: 15 Pages: 151108
Month: October
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.
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