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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Electromagnetics

Background:

  • Metasurfaces enable ultra-thin optical components but typically have fixed focal points.
  • Conventional metasurfaces lack reconfigurability, limiting their practical applications in dynamic focusing scenarios.

Purpose of the Study:

  • To develop a flat, reprogrammable reflective component for dynamic focusing of terahertz waves in the near-field.
  • To overcome the limitations of non-adaptive conventional metasurfaces by introducing reconfigurable functionality.

Main Methods:

  • Proposed a graphene-based unit cell exhibiting tunable phase characteristics.
  • Employed the coding metasurface approach to design the required phase profile for targeted near-field focusing.
  • Utilized terahertz (THz) wave manipulation techniques.

Main Results:

  • The designed component operates near the diffraction limit, achieving high focusing accuracy and range.
  • Demonstrated the component's ability to dynamically reprogram its focal point in the terahertz near-field.
  • Achieved low focusing error and high focusing efficiency.

Conclusions:

  • The reprogrammable graphene metasurface offers a viable solution for dynamic terahertz focusing.
  • This technology can enable compact terahertz scanning and imaging systems.
  • Potential applications include novel reconfigurable components for terahertz wireless communications.