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Negative reflection and negative surface wave conversion from obliquely incident electromagnetic waves.

Shuo Liu1,2, Tie Jun Cui1,2, Ahsan Noor1,2

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Summary

Scientists developed an anisotropic digital coding metasurface for dual control of propagating waves (PWs) and surface waves (SWs). This single pattern enables negative reflection and surface wave manipulation for advanced applications.

Keywords:
anisotropiccoding metasurfacenegative reflectionnegative surface waveoblique incidencespatial wavesurface wave

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Area of Science:

  • Electromagnetics and Metamaterials
  • Wave Physics
  • Materials Science

Background:

  • Controlling wave propagation, including propagating waves (PWs) and surface waves (SWs), is crucial in various scientific and engineering fields.
  • Exotic phenomena like negative reflection of PWs and negative surface waves present unique challenges and opportunities for wave manipulation.
  • Existing metasurface technologies often lack the versatility to control both PWs and SWs simultaneously or adapt to diverse conditions.

Purpose of the Study:

  • To experimentally demonstrate an anisotropic digital coding metasurface capable of simultaneously controlling both PWs and SWs.
  • To propose a simple coding method for achieving dual functionalities (PW or SW manipulation) under orthogonal polarizations at oblique incidences.
  • To enhance the adaptability of digital coding metasurfaces for practical applications in wave control.

Main Methods:

  • Design and fabrication of an anisotropic digital coding metasurface using elaborately designed ellipse-shaped coding particles.
  • Development of a digital coding method based on the digital description of metasurfaces.
  • Experimental demonstration of various wave manipulation functions, including negative reflection of PWs and negative SWs, under oblique incidences.
  • Validation of experimental results through theoretical and numerical predictions.

Main Results:

  • Successful demonstration of an anisotropic digital coding metasurface with a single coding pattern for dual PW and SW control.
  • Experimental validation of negative reflection of PWs and negative SWs under oblique incidences.
  • Achievement of arbitrary combinations of anomalous reflection and negative phenomena.
  • Good agreement between experimental, theoretical, and numerical results.

Conclusions:

  • The proposed anisotropic digital coding metasurface offers a unified platform for controlling both PWs and SWs.
  • The developed coding method enhances the adaptability of metasurfaces for real-world scenarios, including oblique incidences and dual polarizations.
  • This advancement holds significant potential for broad applications in radar detection, wireless communications, and imaging systems.