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Updated: May 16, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Nonlinear Information Metasurface for Second-Harmonic Generation, Manipulation, and Backscatter Communication.

Tianyao Li1,2, Zhangjie Luo1,2, Junwei Tai1,2

  • 1State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.

ACS Applied Materials & Interfaces
|May 5, 2025
PubMed
Summary

This study introduces a nonlinear information metasurface (IMS) for generating frequency-multiplied harmonics. The IMS enables advanced harmonic backscatter communication (BackCom) with controllable beam-steering and digital modulation.

Keywords:
Backscatter communicationfrequency-multiplication harmonicharmonic generationharmonic scatteringinformation metasurface

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Area of Science:

  • Metamaterials and Nanophotonics
  • Electromagnetics and Wave Phenomena

Background:

  • Metamaterials enable spatial wave to harmonic frequency conversion.
  • Practical applications of these harmonics, especially in communication, remain underexplored.

Purpose of the Study:

  • To propose and demonstrate a nonlinear information metasurface (IMS) for harmonic generation.
  • To showcase the application of IMS in harmonic backscatter communication (BackCom).

Main Methods:

  • Designed and fabricated a prototype IMS with digitally controlled meta-atoms.
  • Investigated frequency multiplication and dynamic phase control of the second harmonic (SH).
  • Integrated the IMS into a BackCom system for beam-steering and digital modulation.

Main Results:

  • Achieved relatively high frequency-conversion efficiency.
  • Demonstrated real-time controllable SH scattering.
  • Successfully implemented binary and quadrature phase shift keying modulation on the SH carrier wave.

Conclusions:

  • The nonlinear IMS is a promising solution for BackCom systems.
  • Offers enhanced performance and reduced interference by utilizing separate frequency channels.
  • Addresses challenges in increasingly congested spectral environments.