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Broadband and Programmable Amplitude-Phase-Joint-Coding Information Metasurface.

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Researchers developed a programmable amplitude-phase-joint-coding (APJC) metasurface. This advanced information metasurface allows independent real-time control of electromagnetic wave amplitude and phase for enhanced functionality.

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Area of Science:

  • Electromagnetics and Metasurface Technology
  • Information Science and Engineering

Background:

  • Information metasurfaces are crucial for bridging the physical world and information science.
  • Existing metasurfaces often rely on phase-only or amplitude-only coding, limiting their capabilities.
  • A need exists for metasurfaces offering simultaneous and independent control over both amplitude and phase.

Purpose of the Study:

  • To propose and demonstrate a broadband, programmable amplitude-phase-joint-coding (APJC) information metasurface.
  • To achieve independent real-time control of both amplitude and phase of reflected electromagnetic waves.
  • To showcase the application of this APJC metasurface in manipulating electromagnetic wave propagation.

Main Methods:

  • Integration of PIN diodes within meta-atoms for voltage-controlled amplitude and phase.
  • Design and fabrication of a broadband APJC information metasurface.
  • Experimental and numerical validation of the metasurface's performance from 8 to 13 GHz.

Main Results:

  • Continuous control of reflection amplitude from 0.1 to 0.9 and 1-bit phase switching (approx. 180°).
  • Real-time, independent 1-bit or multibit amplitude coding and 1-bit phase coding capabilities.
  • Demonstrated suppression of scattering beam sidelobes and generation of arbitrary magnitude diffractive waves.

Conclusions:

  • The proposed APJC information metasurface enables unprecedented real-time, independent control over electromagnetic wave energy and wavefront.
  • This technology offers significant advantages for advanced applications in electromagnetic wave manipulation.
  • The broadband and programmable nature of the APJC metasurface opens new avenues for future device development.