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High-efficiency terahertz devices based on cross-polarization converter.

Huan Zhao1, Xinke Wang1, Jingwen He2

  • 1Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, and Beijing Advanced Innovation Center for Imaging Technology, Beijing, 100048, P. R. China.

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High-efficiency terahertz devices using bilayer metasurfaces achieve 85% conversion efficiency. This breakthrough enables practical applications for terahertz (THz) metalenses and holograms.

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Area of Science:

  • Optics and Photonics
  • Metamaterials Science
  • Terahertz Technology

Background:

  • Metasurface devices offer unique optical properties but often face limitations in efficiency.
  • Low efficiency hinders the practical application of many metasurface-based devices.

Purpose of the Study:

  • To demonstrate high-efficiency terahertz (THz) devices utilizing bilayer metasurface structures.
  • To investigate the mechanism behind efficient cross-polarization conversion.
  • To showcase the fabrication and performance of THz metalenses and holograms.

Main Methods:

  • Design and fabrication of bilayer metasurface-based cross-polarization converters.
  • Experimental characterization of polarization conversion efficiency.
  • Design, fabrication, and experimental testing of THz metalenses and phase holograms.

Main Results:

  • Achieved an experimental cross-polarization conversion efficiency of 85% for THz waves.
  • Demonstrated successful focusing and imaging with fabricated THz metalenses.
  • Showcased the image reconstruction capabilities of designed THz phase holograms.

Conclusions:

  • Bilayer metasurface structures enable high-efficiency THz devices.
  • The demonstrated devices (metalenses, holograms) exhibit excellent performance.
  • This technology holds promise for practical THz applications.