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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range.

Lin Peng1,2, Xing Jiang3, Si-Min Li3,4

  • 1Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin, 541004, Guangxi, China. penglin@guet.edu.cn.

Nanoscale Research Letters
|December 1, 2018
PubMed
Summary

This study introduces a novel multi-functional device (MFD) for terahertz (THz) waves, capable of switching between absorption and polarization conversion modes. This breakthrough overcomes limitations of single-function THz components.

Keywords:
Absorption modeGrapheneMetasurfacePolarization conversion modeTerahertz

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Terahertz Technology

Background:

  • Terahertz (THz) electromagnetic (EM) wave components typically offer single functionalities, limiting their practical applications.
  • Existing THz devices often perform either polarization conversion or energy absorption, necessitating separate components for complex tasks.

Purpose of the Study:

  • To propose and demonstrate a multi-functional device (MFD) for terahertz waves that can dynamically switch between absorption and polarization conversion modes.
  • To overcome the limitations of single-function THz components through an innovative device design.

Main Methods:

  • A low-profile, multi-functional device (MFD) was designed and constructed using a graphene-based absorbing metasurface (AM) and a gold-based polarization conversion metasurface (PCM).
  • The device's functionality is controlled by tuning the chemical potential (μc) of graphene, enabling a switch between absorption and polarization conversion (PC) functionalities.
  • Numerical simulations were performed to evaluate the device's performance in both absorption and PC modes across various terahertz frequencies.

Main Results:

  • In polarization conversion (PC) mode, the device achieved a simulated polarization conversion ratio (PCR) greater than 0.9 within the 2.11-3.63 THz frequency band.
  • In absorption mode, the device exhibited simulated absorptivity exceeding 80% over the 1.59-4.54 THz frequency range, with a peak of 96.4% at 3.06 THz.
  • The study discussed the physical mechanisms and operating characteristics, confirming the steerable absorption and polarization conversion capabilities.

Conclusions:

  • The proposed graphene-based MFD successfully integrates absorption and polarization conversion functionalities, offering a significant advancement in terahertz component design.
  • The device's ability to switch modes by controlling graphene's chemical potential provides a versatile platform for terahertz applications.
  • This research holds potential for enhancing terahertz imaging, sensors, photodetectors, and modulators through its multi-functional capabilities.