Space–Time–Frequency Modulation Mechanisms of Monochromatic and Nonmonochromatic Electromagnetic Waves on a Digital Programmable Transmission Metasurface

By dynamically configuring unit structures, a digital programmable metasurface (DPM) can perform space, time, and frequency modulations of electromagnetic (EM) waves directly on the aperture, and hence linking the metasurface physics to digital information worlds. However, the interactions between D...

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Bibliographic Details
Published in:Advanced functional materials 2022-03, Vol.32 (13), p.n/a
Main Authors: Wan, Xiang, Wang, Jia Wei, Huang, Zi Ai, Li, Bai Yang, Xiao, Qiang, Cui, Tie Jun
Format: Article
Language:English
Subjects:
digital programmable metasurfaces
Electromagnetic radiation
Fourier analysis
Fourier transforms
Frequency modulation
intelligent sensing
Materials science
Metasurfaces
Radar equipment
space–time–frequency coding
Superposition (mathematics)
Time-frequency analysis
wireless communication
Wireless communications
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Summary:By dynamically configuring unit structures, a digital programmable metasurface (DPM) can perform space, time, and frequency modulations of electromagnetic (EM) waves directly on the aperture, and hence linking the metasurface physics to digital information worlds. However, the interactions between DPMs and EM waves have not yet been systematically and efficiently depicted. Based on the Huygens–Fresnel principle and Fourier analysis, here the authors demonstrate the foundations of space–time–frequency joint controls of monochromatic or nonmonochromatic EM waves by DPM. Due to linear superposition properties of Fourier transform in the analysis, the space– and time–frequency modulations are naturally decoupled, hence enabling simultaneous and independent space–time–frequency controls of the EM waves. A transmissive DPM is designed and fabricated to interpret the space–time–frequency joint modulations. This work will facilitate the researches on DPMs and promote the applications of DPMs in wireless communications, intelligent sensing, and radar systems. For radar and wireless communications based on digital programmable metasurfaces (DPMs), it is of key importance to reveal the interactions between DPMs and non‐monochromatic waves. Based on the Huygens‐Fresnel principle, the authors systematically reveal the basic principles of DPM‐based space‐time‐frequency modulations of both monochromatic and non‐monochromatic electromagnetic waves, hence extending the application scenarios of DPMs.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202107557