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Metacrystals: inversely-designed 3D-printed intelligent panels for 6G communications.
Mohammad M Asgari1, Peter B Catrysse2, Shuai S A Yuan3
1Aalto University, Department of Electronics and Nanoengineering, Espoo, Finland. mohammadmahdi.asgari@aalto.fi.
Nature Communications
|June 8, 2026
Summary
Researchers developed passive intelligent panels, called metacrystals, to enhance communication systems. These panels offer complex, independent control over multiple waves, overcoming limitations of traditional metasurfaces for improved performance.
Area of Science:
- Electromagnetics and wave phenomena
- Materials science
- Communication engineering
Background:
- Metasurfaces offer potential for advanced communication systems.
- Passive metasurfaces are desirable due to low cost and no power requirements.
- Existing passive metasurfaces have limitations in handling multiple polarizations, frequencies, or incidence angles.
Purpose of the Study:
- To introduce passive intelligent panels, termed metacrystals, for overcoming limitations of conventional metasurfaces.
- To enable complex, simultaneous, and independent control of multiple incident waves.
- To demonstrate advanced functionalities in reflection and transmission regimes.
Main Methods:
- Proposed a compact volumetric architecture that utilizes finite thickness to increase degrees of freedom.
- Employed inverse topology optimization for designing metacrystals.
- Conducted simulations and experimental validation.
Main Results:
- Demonstrated all-dielectric metacrystals capable of simultaneous anomalous reflection and absorption.
- Showcased control in both transmission and reflection regimes.
- Validated structural integrity, scalability, and compatibility with 3D printing up to 100 GHz.
Conclusions:
- Metacrystals represent a significant advancement over traditional metasurfaces for communication applications.
- The proposed design offers unprecedented control over multiple wave parameters independently.
- The technology is scalable, robust, and manufacturable using low-cost 3D printing for high-frequency applications.
