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Random Time-Space Coding Metasurfaces for Spatial Control of the Temporal Statistics of Electromagnetic Fields.

Jia Cheng Li1, Jiang Han Bao1, Che Liu1

  • 1State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China.

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Summary
This summary is machine-generated.

This study introduces random time-space coding metasurfaces (RTCM) to control random electromagnetic (EM) fields. The framework enables precise spatial distribution of EM field statistical properties for advanced applications.

Keywords:
random electromagnetic fieldsrandom time‐space coding metasurfaces (RTCM)spatial controltemporal statistics

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Area of Science:

  • Metasurface technology
  • Electromagnetic field control
  • Statistical physics

Background:

  • Conventional digital coding metasurfaces generate deterministic electromagnetic (EM) responses.
  • Controlling random EM fields requires achieving target temporal statistical properties.
  • Existing methods lack control over spatial distributions of statistical properties like mean and variance.

Purpose of the Study:

  • To propose a novel framework for controlling the spatial distribution of temporal statistical properties of EM fields.
  • To utilize random time-space coding metasurfaces (RTCM) for probabilistic EM field structuring.
  • To enable simultaneous direct transmission and jamming capabilities.

Main Methods:

  • Development of a statistical model for RTCM within a probability space.
  • Establishing the relationship between random code distributions (marginal and pairwise joint) and EM field statistics (mean and variance).
  • Generating time-varying random EM fields using sampling codes constrained by target statistical distributions.

Main Results:

  • Demonstrated that spatial mean and variance distributions of EM fields are governed by the statistical properties of the random codes.
  • Successfully generated time-varying random EM fields with desired spatial mean and variance distributions.
  • Showcased the capability for simultaneous direct transmission and jamming through spatial mean and variance peaks.

Conclusions:

  • The proposed framework extends metasurface applications into the probability domain, shifting from deterministic to probabilistic control.
  • This research opens new avenues for communication systems, information security, and electromagnetic countermeasures.
  • RTCM offers a powerful new paradigm for advanced EM field manipulation.