Continuous metasurface for high-performance anomalous reflection

Abstract

A new type of a metasurface, known as a continuous metasurface, having only one trapezoidal antenna within a super cell, is proposed. Markedly different from previously reported discrete metasurfaces having multiple discrete antennas within a super cell, continuous metasurfaces can provide a continuously varying phase response for anomalous reflection following the generalized Snell's law. The inherent spatial continuity of the phase response and the elimination of near-field coupling among neighboring antennas enable the continuous metasurface to achieve low-distortion, high-efficiency, and ultrawide-band anomalous reflection. The concept of continuous metasurfaces offers a new alternative to design flat plasmonic optical components.