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Related Experiment Video

Updated: Jan 3, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Directional Janus Metasurface.

Ke Chen¹, Guowen Ding¹, Guangwei Hu^2,3

¹School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.

Advanced Materials (Deerfield Beach, Fla.)

|November 21, 2019

Summary

This summary is machine-generated.

Janus metasurfaces, two-faced 2D materials, offer unique asymmetric transmission. These passive devices enable direction-dependent functionalities like one-way focusing and holograms, advancing optical control.

Keywords:

Janus metasurfaces asymmetric transmission chiral materials holograms lenses

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Area of Science:

Photonics and Metamaterials
Materials Science
Nanotechnology

Background:

Janus monolayers, with their inherent asymmetry, show promise in electronics and photonics.
Previous work demonstrated spin-dependent control of hydrogenation/dehydrogenation in Janus materials.
The broken out-of-plane symmetry of Janus materials enables direction-dependent optical functionalities.

Purpose of the Study:

To demonstrate a passive Janus metasurface for controlling light propagation.
To realize asymmetric transmission and direction-dependent functionalities using geometric twists.
To experimentally validate functionalities such as one-way anomalous refraction and focusing.

Main Methods:

Fabrication of a passive Janus metasurface using cascaded subwavelength anisotropic impedance sheets.
Introduction of rotational twists in the metasurface geometry to engineer asymmetric transmission.
Experimental demonstration of functionalities including one-way anomalous refraction, focusing, and holograms.

Main Results:

Achieved asymmetric transmission with tailored phase functions through geometric manipulation.
Demonstrated direction-dependent functionalities enabled by the broken out-of-plane symmetry.
Experimentally validated one-way anomalous refraction, asymmetric focusing, and direction-controlled holograms.

Conclusions:

Passive Janus metasurfaces offer a versatile platform for directional optical control.
The broken symmetry is key to achieving distinct functionalities for opposite propagation directions.
This work paves the way for novel optical devices with direction-dependent characteristics.