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This study introduces an active beam switching device using electro-optic metasurfaces controlled by a single gate bias on graphene. It achieves efficient, directional beam profiles with a large deflection angle, simplifying device operation.

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Area of Science:

  • Photonics and Metamaterials
  • Optoelectronics
  • Nanotechnology

Background:

  • Electro-optic active metasurfaces offer electronic control of optical wavefronts.
  • Traditional metasurfaces often require complex gate arrays and suffer from low optical efficiency.

Purpose of the Study:

  • To demonstrate a simplified active beam switching device with high optical efficiency and large deflection angles.
  • To explore the use of monolayer graphene for modulating optical conductivity in metasurfaces.

Main Methods:

  • Device fabrication and characterization of an active metasurface.
  • Optimization of key performance metrics (absolute and relative efficiency) using a genetic algorithm.
  • Development of an analytical framework based on nonlocal quasinormal mode expansion.

Main Results:

  • Achieved 57° active beam switching with high absolute efficiencies (0.084 and 0.078) and relative efficiencies (0.765 and 0.836).
  • Demonstrated uniform optical efficiencies across diffraction orders.
  • Provided insights into the operating mechanism via analytical modeling.

Conclusions:

  • The single-gate graphene-based metasurface offers a promising platform for efficient active beam switching.
  • The simplified driving mechanism overcomes limitations of previous metasurface designs.
  • Further improvements are possible by addressing performance limitations of the current design.