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Suspended Metasurface for Broadband High-Efficiency Vortex Beam Generation
Luyi Wang1,2, Hongyu Shi1,2, Jianjia Yi3
1Shaanxi Key Laboratory of Deep Space Exploration Intelligent Information Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Materials (Basel, Switzerland)
|February 15, 2022
Summary
This study presents a novel suspended metasurface for efficient broadband generation of orbital angular momentum (OAM) vortex beams. The design achieves high efficiency across a wide frequency range, enabling advanced applications.
Area of Science:
- Metasurfaces
- Electromagnetic wave manipulation
- Photonics and optics
Background:
- Orbital angular momentum (OAM) waves exhibit unique phase vortex and amplitude singularity.
- Broadband OAM generation is crucial for advanced applications like high-capacity communications and imaging.
Purpose of the Study:
- To propose a suspended metasurface structure for broadband OAM generation with high efficiency.
- To investigate metasurface aperture phase distribution for maximizing OAM generator efficiency.
Main Methods:
- Design and simulation of a low-Q factor suspended metasurface.
- Analysis of different metasurface aperture phase distributions.
- Experimental validation through measurement.
Main Results:
- Achieved broadband vortex beam generation with OAM orders of 1 and 2.
- Maximized OAM generator efficiency through optimized phase distribution.
- Demonstrated operation from 4-10 GHz with over 82% efficiency.
Conclusions:
- The proposed suspended metasurface enables efficient broadband OAM generation.
- This design offers a pathway for realizing broadband metasurfaces and high-efficiency OAM devices.
