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Electrically controlled terahertz magneto-optical phenomena in continuous and patterned graphene.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Magnetic circular dichroism and Faraday rotation are crucial magneto-optical phenomena, essential for controlling light polarization.
  • Existing materials often require strong magnetic fields and offer limited tunability, especially in the terahertz (THz) frequency range.
  • There is a significant need for novel materials exhibiting tunable non-reciprocal polarization control in the THz spectrum.

Purpose of the Study:

  • To investigate the modulation, tuning, and inversion of magnetic circular dichroism and Faraday rotation in graphene.
  • To explore the potential of electrostatic doping for controlling THz magneto-optical responses in graphene.
  • To identify and characterize magneto-plasmonic resonances in patterned graphene structures for THz applications.

Main Methods:

  • Broadband terahertz magneto-electro-optical spectroscopy was employed to probe graphene's response.
  • Graphene samples were subjected to electrostatic doping via gate voltage.
  • Patterned graphene antidot arrays were fabricated to study plasmonic effects.

Main Results:

  • Demonstrated that both magnetic circular dichroism and Faraday rotation in graphene can be modulated and tuned via electrostatic doping.
  • Achieved inversion of these magneto-optical effects at a fixed magnetic field by altering doping levels.
  • Observed strong magneto-plasmonic resonances in graphene antidot arrays, indicating potential for broad THz range applications.

Conclusions:

  • Graphene offers unprecedented electrostatic control over THz magneto-optical effects, surpassing traditional magnetic field-dependent methods.
  • Electrostatic doping provides a versatile route for tuning and inverting Faraday rotation and magnetic circular dichroism in graphene.
  • Patterned graphene structures show promise for developing novel THz devices utilizing magneto-plasmonic resonances.