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Active tunable plasmonically induced polarization conversion in the THz regime.

Furi Ling1,2, Gang Yao1, Jianquan Yao1,3

  • 1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.

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Summary

This study demonstrates a graphene-based structure for plasmon-induced polarization conversion in the terahertz (THz) range. The device actively tunes THz wave polarization, enabling applications in sensing and communications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Terahertz (THz) technology requires advanced components for signal manipulation.
  • Graphene's tunable electronic properties offer potential for novel THz devices.

Purpose of the Study:

  • To demonstrate a chip-scale active terahertz device for plasmon-induced polarization conversion (PIPC).
  • To investigate the tunability of the device's optical properties via electrostatic gating.

Main Methods:

  • Fabrication of a periodically patterned graphene structure with T-shaped strips.
  • Electrostatic gating to control graphene's Fermi level and electron relaxation time.
  • Analysis using the coupled Lorentz oscillator model.

Main Results:

  • Achieved tunable peak frequency and group index in the transparency window.
  • Demonstrated polarization conversion from linear to elliptical and circular THz waves.
  • Tuning achieved by modulating graphene's Fermi level and electron relaxation time.

Conclusions:

  • The demonstrated PIPC structure offers active control over terahertz wave polarization.
  • This chip-scale device has significant potential for terahertz sensing and communication applications.