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Related Experiment Video

Updated: Jul 29, 2025

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Direction-Duplex Janus Metasurface for Full-Space Electromagnetic Wave Manipulation and Holography.

Weixu Yang1, Ke Chen1, Shufang Dong1

  • 1School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China.

ACS Applied Materials & Interfaces
|May 24, 2023
PubMed
Summary
This summary is machine-generated.

Janus metasurfaces offer dual functionality by controlling electromagnetic waves based on propagation direction. This breakthrough enables multifunctional devices with distinct transmission and reflection properties for diverse applications.

Keywords:
Janus metasurfacefull-space controlholographymicrowave regionmultifunctional metasurface

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Area of Science:

  • Metasurfaces and Nanophotonics
  • Electromagnetics and Wave Phenomena
  • Materials Science

Background:

  • Janus metasurfaces are two-faced 2D materials with out-of-plane asymmetry.
  • Their unique properties allow for distinct functions based on electromagnetic wave propagation direction (k-direction).
  • Growing demand exists for integrating multiple functionalities into single optoelectronic devices.

Purpose of the Study:

  • To propose and demonstrate the concept of a direction-duplex Janus metasurface.
  • To achieve full-space wave control with different transmission and reflection wavefronts for opposite k-directions.
  • To enable asymmetric full-space wave manipulations for multifunctional meta-devices.

Main Methods:

  • Conceptualization of direction-duplex Janus metasurfaces.
  • Design and fabrication of Janus metasurface devices.
  • Experimental demonstration of asymmetric wave manipulations.

Main Results:

  • Demonstration of direction-duplex Janus metasurfaces for full-space wave control.
  • Achieved drastically different transmission and reflection wavefronts for same polarized incidence with opposite k-directions.
  • Experimental validation of integrated metalenses, beam generators, and direction-duplex meta-holography.

Conclusions:

  • The proposed Janus metasurface platform enables sophisticated multifunctional meta-devices.
  • Opens new possibilities for wave control from microwaves to optical systems.
  • Facilitates the integration of diverse functionalities into single devices.