Planar Metasurface Design for Wide-Angle Refraction Using Interface Field Optimization
2021
Wide-angle planar metasurface refractors are designed by synthesizing complete interface fields corresponding to passive and lossless characteristics. To the Floquet modes associated with a refraction function, additional Floquet mode contents are introduced to the inner and outer layers and optimized to render all admittance sheets between layers purely reactive. For optimized three-layer designs, full-wave simulations show perfect refraction without reflections. Analysis of a physical three-layer metallic sheet design shows high-efficiency refraction without supercell-level optimizations.
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