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A Time-Modulated Transparent Nonlinear Active Metasurface for Spatial Frequency Mixing.

Luyi Wang1,2, Hongyu Shi1,2, Gantao Peng1

  • 1School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

Materials (Basel, Switzerland)
|February 15, 2022
PubMed
Summary

This study introduces a novel time-modulated metasurface for electromagnetic wave frequency mixing. The device enables tunable control over wave transmission, achieving frequency mixing with suppressed harmonics.

Keywords:
nonlinear metasurfacetime-modulated metasurfacevaractor diode

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Area of Science:

  • Metamaterials and Nanophotonics
  • Nonlinear Optics
  • Electromagnetic Wave Manipulation

Background:

  • Metasurfaces offer advanced control over electromagnetic waves.
  • Nonlinear active metasurfaces are crucial for frequency mixing applications.
  • Time-modulation introduces dynamic control capabilities.

Purpose of the Study:

  • To propose and demonstrate a time-modulated transparent nonlinear active metasurface.
  • To achieve spatial electromagnetic (EM) wave frequency mixing.
  • To investigate the nonlinear transmission characteristics under time-modulated biasing.

Main Methods:

  • Design and fabrication of a metasurface loaded with varactor diodes.
  • Application of time-modulated biasing signals to control transmission properties.
  • Analysis of transmission phase and amplitude variations with bias voltage.

Main Results:

  • Continuous 360° transmission phase control at 5 GHz achieved.
  • Transmission amplitude varied between -2.1 dB and -2.7 dB.
  • Successful demonstration of frequency mixing and harmonic generation with suppression of unwanted higher orders.

Conclusions:

  • The proposed time-modulated active metasurface effectively realizes spatial EM wave frequency mixing.
  • The nonlinear transmission characteristics enable tunable frequency conversion.
  • Experimental validation confirms the theoretical predictions.