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Full-State Controls of Terahertz Waves Using Tensor Coding Metasurfaces.

Shuo Liu, Hao Chi Zhang, Lei Zhang

  • 1Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University , Tianjin 300072, China.

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|June 6, 2017
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Summary
This summary is machine-generated.

This study introduces a tensor coding metasurface for terahertz (THz) frequencies, enabling full control over electromagnetic waves. The novel metasurface demonstrates anomalous reflection and conversion of propagating waves to surface waves with cross-polarizations.

Keywords:
coding metasurfacesmetasurfacesurface wavetensorterahertz frequencies

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Area of Science:

  • Metamaterials
  • Electromagnetics
  • Nanophotonics

Background:

  • Coding metasurfaces offer digital control over metamaterials.
  • Metasurfaces enable functionalities like anomalous reflection and polarization conversion.

Purpose of the Study:

  • To propose a tensor coding metasurface for full-state control of terahertz (THz) electromagnetic waves.
  • To demonstrate anomalous reflection and propagating wave (PW) to surface wave (SW) conversion at THz frequencies.

Main Methods:

  • Design and simulation of a 3-bit tensor coding metasurface.
  • Utilizing off-diagonal elements in the reflection matrix for cross-polarization control.
  • Analysis of phase and amplitude distributions for wave manipulation.

Main Results:

  • The tensor coding metasurface achieves full-state control of THz waves, including polarization, phase, amplitude, and wave-vector.
  • Demonstrated anomalous reflection of normally incident THz beams to anomalous directions with cross-polarizations.
  • Successfully achieved THz PW-SW conversion for both x- and y-polarized normal incidences, generating cross-polarized transverse-magnetic and transverse-electric surface waves.

Conclusions:

  • The proposed tensor coding metasurface provides unprecedented control over THz wave properties.
  • This technology enables advanced THz applications such as novel beam steering and wave conversion devices.
  • The demonstrated PW-SW conversion opens new avenues for THz surface wave manipulation and device integration.