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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Generation of wideband vortex beam with different OAM modes using third-order meta-frequency selective surface
Optics Express
|December 28, 2019
Summary
A new meta-frequency selective surface (meta-FSS) enables wideband orbital angular momentum (OAM) beam generation. This low-profile device efficiently converts circularly polarized waves into OAM vortex beams for advanced wireless communication.
Area of Science:
- Electromagnetics and Optics
- Metamaterials
- Wireless Communication
Background:
- Orbital angular momentum (OAM) beams offer potential for high-capacity wireless communication.
- Existing transmissive OAM generators face limitations like narrow bandwidth, bulky profiles, and low efficiency.
Purpose of the Study:
- To develop a novel wideband meta-frequency selective surface (meta-FSS) for generating focusing vortex beams.
- To overcome limitations of current OAM generators, focusing on low profile, high efficiency, and wide bandwidth.
Main Methods:
- Design of a third-order band-pass meta-FSS element operating in the X-band.
- Fabrication and measurement of OAM generator prototypes using the proposed meta-FSS.
- Numerical simulations and experimental verification of the OAM generation performance.
Main Results:
- The meta-FSS exhibits a third-order band-pass filter property with low profile, high transmissivity, and large angular stability.
- Prototypes successfully generated OAM modes +1 and -2.
- Efficient conversion of incident left/right-handed circularly polarized (L/RHCP) spherical waves to right/left-handed circularly polarized (R/LHCP) OAM vortex waves from 9.0 GHz to 11.0 GHz with high mode purity.
Conclusions:
- The developed meta-FSS is a promising solution for wideband OAM beam generation.
- The proposed structure paves the way for novel low-profile wireless communication devices with enhanced OAM capabilities.
- High agreement between experimental and numerical results validates the design's effectiveness.
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