High-efficiency wideband flat focusing reflector mediated by metasurfaces

Yu Ji-Bao^a), Ma Hua†^a), Wang Jia-Fu^a), Li Yong-Feng^a), Feng Ming-De^a),^b), Qu Shao-Bo‡^a)

(a) A photograph of the fabricated metasurface; (b) schematic of the ESRRs array; (c) schematic of the super unit cell.