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Area of Science:

  • Metamaterials and Nanophotonics
  • Electromagnetics and Wave Theory
  • Digital Signal Processing

Background:

  • Digital coding metasurfaces offer real-time electromagnetic wave control and programmable functionalities.
  • Existing metasurfaces are limited to spatial encoding, neglecting the temporal dimension.
  • Exploiting the temporal dimension is key to unlocking advanced wave manipulation capabilities.

Purpose of the Study:

  • To propose a general theory for space-time modulated digital coding metasurfaces.
  • To achieve simultaneous control of electromagnetic waves in both spatial and frequency domains.
  • To demonstrate applications in harmonic beam steering, beam shaping, and scattering-signature control.

Main Methods:

  • Development of a general theory for space-time modulation in digital coding metasurfaces.
  • Design and simulation of metasurface configurations incorporating temporal dynamics.
  • Implementation of a prototype using a field-programmable gate array (FPGA) for space-time coding.
  • Experimental validation of the proposed space-time coding sequence for harmonic beam steering.

Main Results:

  • Simultaneous control over wave propagation direction and harmonic power distribution achieved.
  • Successful demonstration of harmonic beam steering using an optimized space-time coding sequence.
  • Numerical and experimental results show good agreement, validating the proposed approach.
  • The metasurface prototype exhibited good performance in controlling EM wave properties.

Conclusions:

  • Space-time modulated digital coding metasurfaces provide enhanced control over electromagnetic waves.
  • The proposed theory and experimental validation open new avenues for real-time wave manipulation.
  • Potential applications span wireless communications, cognitive radars, adaptive beamforming, and holographic imaging.