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Optically-Controlled Terahertz Multifunctional Polarization Conversion Metasurface with Reflection and Transmission

Ying Tian1, Lichang Han1, Li Yan1

  • 1Sichuan Aerospace Liaoyuan Science and Technology Co., Ltd., Chengdu 610100, China.

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|September 23, 2022
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Summary

This study introduces a novel optically-controlled metasurface for terahertz applications. It achieves multifunctional polarization conversion using different wavelengths of light to control photosensitive semiconductors, enabling easy device manipulation.

Keywords:
metasurfacemultifunctionpolarization conversionterahertz

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Electrical Engineering

Background:

  • Integrating multiple functionalities into compact devices presents a significant challenge in the terahertz (THz) band.
  • Existing THz devices often lack reconfigurability and multifunctionality within a single unit structure.

Purpose of the Study:

  • To propose and demonstrate an optically-controlled multifunctional linear polarization conversion metasurface for terahertz applications.
  • To enable independent control of reflection and transmission polarization conversion using external optical stimuli.

Main Methods:

  • Design of a multilayer metasurface incorporating photosensitive semiconductors (Germanium and Silicon).
  • Utilizing pump light of varying wavelengths and intensities to alter semiconductor states and control polarization conversion.
  • Analysis of the working principle through eigenmode theory and surface current distribution simulations.

Main Results:

  • Achieved broadband reflection polarization conversion with a relative bandwidth of 102.4%.
  • Achieved broadband transmission polarization conversion with a relative bandwidth of 98.9%.
  • Demonstrated tunability of device efficiency by adjusting pump light intensity and wavelength.

Conclusions:

  • The proposed metasurface offers a facile method for manipulating multifunctional devices in the terahertz spectrum.
  • The design showcases the potential of photosensitive semiconductors for dynamic control of polarization conversion.
  • The study confirms the stability of the metasurface against variations in structural parameters and incident angles.