Unidirectional guided-wave-driven metasurfaces for arbitrary wavefront control

Shiqing Li, Kosmas L. Tsakmakidis (), Tao Jiang, Qian Shen, Hang Zhang, Jinhua Yan, Shulin Sun and Linfang Shen ()
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Shiqing Li: Zhejiang University of Technology
Kosmas L. Tsakmakidis: National and Kapodistrian University of Athens Panepistimioupolis
Tao Jiang: University of Electronic Science and Technology of China
Qian Shen: Zhejiang University of Technology
Hang Zhang: Zhejiang University of Technology
Jinhua Yan: Zhejiang University of Technology
Shulin Sun: Fudan University
Linfang Shen: Zhejiang University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Metasurfaces are capable of fully reshaping the wavefronts of incident beams in desired manners. However, the requirement for external light excitation and the resonant nature of their meta-atoms, make challenging their on-chip integration. Here, we introduce the concept and design of a fresh class of metasurfaces, driven by unidirectional guided waves, capable of arbitrary wavefront control based on the unique dispersion properties of unidirectional guided waves rather than resonant meta-atoms. Upon experimentally demonstrating the feasibility of our designs in the microwave regime, we numerically validate the introduced principle through the design of several microwave meta-devices using metal-air-gyromagnetic unidirectional surface magneto-plasmons, agilely converting unidirectional guided modes into the wavefronts of 3D Bessel beams, focused waves, and controllable vortex beams. We, further, numerically demonstrate sub-diffraction focusing, which is beyond the capability of conventional metasurfaces. Our unfamiliar yet practical designs may enable full, broadband manipulation of electromagnetic waves on deep subwavelength scales.

Date: 2024
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DOI: 10.1038/s41467-024-50287-z

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