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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
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Transmissive Digital Coding Metasurfaces for Polarization-Dependent Dual-Mode Quad Orbital Angular Momentum Beams
Sijia Li1,2,3, Zhuoyue Li1, Xiaobin Liu1
1Information and Navigation College, Air Force Engineering University, Xi'an 710077, China.
ACS Applied Materials & Interfaces
|May 3, 2023
Summary
Researchers developed a novel transmissive metasurface capable of simultaneously controlling multiple orbital angular momentum (OAM) states for enhanced wireless communication. This technology enables multiplexing and multichannel capabilities for advanced communication and imaging systems.
Area of Science:
- Electromagnetics and Metamaterials
- Wireless Communication Systems
- Optical Engineering
Background:
- Space-division multiplexing (SDM) using multibeams and mode-division multiplexing (MDM) using multimodes enhance wireless communication capacity.
- Existing transmissive metasurfaces struggle with simultaneous, independent control of orbital angular momentum (OAM) states for both SDM and MDM.
Purpose of the Study:
- To demonstrate a multilayer transmissive digital coding metasurface for generating quad-OAM beams with dual modes from a single source.
- To achieve independent control of OAM states for simultaneous space-division and mode-division multiplexing.
Main Methods:
- Designed a unit cell with cross-dipole geometry to achieve polarization-dependent 3-bit phase responses.
- Engineered two types of transmissive digital coding metasurfaces by encoding phase sequences in the x- and y-directions.
- Validated the metasurface designs through theoretical analysis and experimental fabrication.
Main Results:
- Successfully generated four OAM beams with two topological charges in different directions simultaneously.
- Demonstrated flexible manipulation of multi-OAM beams with different modes using the polarization-dependent phase control.
- Achieved independent control of OAM states for multiplexed spatial and modal channels.
Conclusions:
- The developed transmissive digital coding metasurface enables simultaneous dual-mode and quad-OAM beam generation.
- This scheme offers a simplified approach for multiplexing, multichannel, and multiplatform communication and imaging systems.
- Presents a promising solution for expanding wireless communication channel capacity and functionality.
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