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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene-based optical polarizing devices in waveguides have shown both TE- and TM-pass behaviors.
  • Previous studies often attributed polarization control to the graphene Fermi level (doping level).

Purpose of the Study:

  • To investigate the primary factors determining polarization behavior in graphene-embedded waveguide polarizers.
  • To challenge the conventional assumption that Fermi level solely dictates polarization.
  • To provide a consistent explanation for existing experimental observations.

Main Methods:

  • Numerical simulations were employed to model graphene-embedded waveguide structures.
  • Analysis focused on the influence of waveguide parameters (e.g., superstrate refractive index, waveguide height) and graphene properties.
  • Accurate graphene modeling was utilized to assess Fermi level tuning effects.

Main Results:

  • Waveguide parameters, not graphene's Fermi level, predominantly determine the passing polarization (TE or TM).
  • The study provides a unified explanation for previously reported experimental outcomes.
  • Fermi level tuning cannot switch a waveguide between TE-pass and TM-pass states with accurate graphene modeling.

Conclusions:

  • Waveguide design is a critical, often overlooked, factor in developing effective TE- or TM-pass polarizers.
  • The fraction of the electric field tangential to the graphene layer, controlled by waveguide geometry, dictates polarization.
  • Optimizing waveguide parameters is essential for designing high-performance graphene-based polarizers.