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2-bit coding metasurface with a double layer random flip structure for wide band diffuse reflection and reciprocity
Optics Express
|October 20, 2023
Summary
This study introduces a new 2-bit coding metasurface for enhanced near-infrared applications. The novel design achieves simultaneous distortion-free transmission and diffuse reflection across a wider bandwidth.
Area of Science:
- Metasurfaces
- Nanophotonics
- Electromagnetics
Background:
- 1-bit coding metasurfaces offer simultaneous distortion-free transmission and diffuse reflection.
- Existing 1-bit metasurfaces have limited bandwidth and insufficient coverage in the near-infrared spectrum.
Purpose of the Study:
- To propose and demonstrate a novel vertical 2-bit coding metasurface with enhanced performance.
- To overcome the bandwidth limitations of previous 1-bit coding metasurface designs.
Main Methods:
- Design of a vertical 2-bit coding metasurface using double-layer random-flip meta-atoms (DLRFM).
- Experimental and simulation analysis of transmission and reflection characteristics under varying incidence angles.
Main Results:
- The proposed DLRFM exhibits excellent diffuse reflection and distortion-free transmission.
- Zero-order diffraction intensity in the reflection direction is less than 10% of total reflection for 0°–30° incidence angles.
- The design shows potential for wideband coverage in the near-infrared region by adjusting geometric parameters.
Conclusions:
- The novel DLRFM design significantly improves upon existing 1-bit coding metasurfaces.
- This technology holds promise for advanced applications in displays and lens design within the near-infrared spectrum.
