Low‐Profile Electromagnetic Holography by Using Coding Fabry–Perot Type Metasurface with In‐Plane Feeding

• Published in: Advanced optical materials 2020-05, Vol.8 (9), p.n/a
• Main Authors: Li, He, Li, Yun Bo, Shen, Jia Lin, Cui, Tie Jun
• Format: Article
• Language: English
• Subjects: Algorithms; Coding; Computer simulation; Electromagnetic fields; Fabry–Perot cavity; Gerchberg–Saxton algorithm; hologram; Holograms; Holography; Information theory; Materials science; Metasurfaces; Microwave frequencies; Millimeter waves; Optics; Phase distribution
• ISSN: 2195-1071; 2195-1071
• DOI: 10.1002/adom.201902057

Metasurface holography has been well studied due to its features that are superior to the traditional holographic technologies. However, high profiles of the reflection‐ and transmission‐type configurations in the metasurface holography restrict its applications. On the other hand, digital coding metasurfaces have received great attention recently because they build a link between the information theory and surface electromagnetic fields, which also bring new viewpoint and convenience for digital computational holography. Here, a real low‐profile holographic method is proposed using a leaky‐type 2‐bit coding Fabry–Perot metasurface with in‐plane feeding in the microwave frequency. For constructing the metasurface hologram, the weighted Gerchberg–Saxton algorithm is presented to modulate the energy proportion of focal points by adjusting the phase distribution. As proof of concept, some typical metasurface holograms are demonstrated in microwave experiments at the height of 35 mm (≈3 wavelengths), which show good agreement with theoretical analyses and full‐wave simulations. The design method can be easily extended to the millimeter wave and terahertz bands. A real low‐profile leaky‐type 2‐bit coding Fabry–Perot metasurface with in‐plane feeding in the microwave frequency is proposed to improve the reflection‐ and transmission‐type configurations in metasurface holography. This work opens up potential application to the areas of near‐field wireless communication and electromagnetics certification in not only microwave wave, but millimeter and terahertz bands in the future.