Revealing hidden periodicity in momentum-encoded metasurfaces
Structured planar materials known as metasurfaces enable versatile manipulation of electromagnetic waves at subwavelength scales. Especially, metasurfaces can serve as spatial sampling lattices that encode prescribed in-plane momentum profiles, as commonly employed in phase-gradient and Pancharatnam–Berry metasurfaces. However, such momentum-encoded metasurfaces typically lose global periodicity, complicating rigorous analyses. Here, we introduce a universal geometric framewo
Researchers have developed a new geometric framework to understand and analyze metasurfaces, which are engineered materials used to control electromagnetic waves. These metasurfaces, while powerful, often lack global periodicity, making them difficult to study. The new approach interprets them as Moiré lattices, revealing hidden periodic patterns within these seemingly aperiodic structures.
This breakthrough allows for the representation of complex metasurface designs as simpler, periodic superlattices. This simplification enables a more intuitive characterization of how these devices interact with light, categorizing radiation into distinct diffraction orders. The framework has been successfully applied to various metasurface types, including those with spin-dependent properties, and experimentally verified using photonic crystal slabs.
This new analytical framework simplifies the study of complex metasurface designs, paving the way for more efficient development and application of advanced optical technologies.
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