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Reconfigurable Terahertz Spatial Deflection Varifocal Metamirror.

Jianhui Fang1, Renbin Zhong1, Boli Xu1

  • 1Terahertz Research Center, School of Electronic Science and Engineering, Cooperative Innovation Centre of Terahertz Science, University of Electronic Science and Technology of China, Chengdu 610054, China.

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Summary

This study introduces a novel terahertz spatial varifocal metamirror using a metal-graphene structure for flexible focus adjustment. This innovation enables controllable focus deflection, advancing terahertz device development.

Keywords:
digitally encodedfocal deflectionmetal–graphene metasurfacemetamirror

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Metamaterials

Background:

  • Traditional optical lenses possess fixed focal lengths, requiring bulky components for focus control, hindering miniaturization and integration.
  • Existing terahertz (THz) optical systems face challenges in achieving dynamic focus adjustment due to component size and complexity.

Purpose of the Study:

  • To propose and theoretically define a novel terahertz spatial varifocal metamirror.
  • To demonstrate flexible focus adjustment using a consistent metal-graphene unit structure.
  • To enable controllable deflection of the focus position in space for advanced THz applications.

Main Methods:

  • Design of a terahertz spatial varifocal metamirror based on a metal-graphene unit structure.
  • Theoretical definition of focus deflection angle using Fourier convolution theorem by superimposing encoded sequences.
  • Simulation and analysis of the metamirror's configurable properties for spatial focus manipulation.

Main Results:

  • A novel terahertz spatial varifocal metamirror with a tunable focus is proposed.
  • The focus deflection angle is precisely controllable via superimposed encoded sequences.
  • The metamirror demonstrates the capability to deflect the focus position in space.

Conclusions:

  • The proposed metal-graphene metamirror offers a compact and flexible solution for terahertz focus control.
  • The design concept provides a pathway for developing advanced, reconfigurable terahertz optical devices.
  • This work presents potential advancements in integrated terahertz systems and imaging technologies.