title: Ultrathin pancharatnam-berry metasurface with maximal cross-polarization efficiency.
abstract: Novel ultrathin dual-functional metalenses are proposed, fabricated, tested, and verified in the microwave regime for the first time. The significance is that their anomalous transmission efficiency almost reaches the theoretical limit of 25%, showing a remarkable improvement compared with earlier ultrathin metasurface designs with less than 5% coupling efficiency. The planar metalens proposed empowers significant reduction in thickness, versatile focusing behavior, and high transmission efficiency simultaneously.
authors.affiliation: Department of Microwave Engineering, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Xumin
authors.initials: X
authors.lastname: Ding
authors.forename: Francesco
authors.initials: F
authors.lastname: Monticone
authors.forename: Kuang
authors.initials: K
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Dongliang
authors.initials: D
authors.lastname: Gao
authors.forename: Shah Nawaz
authors.initials: SN
authors.lastname: Burokur
authors.forename: Andre
authors.initials: A
authors.lastname: de Lustrac
authors.forename: Qun
authors.initials: Q
authors.lastname: Wu
authors.forename: Cheng-Wei
authors.initials: CW
authors.lastname: Qiu
authors.forename: Andrea
authors.initials: A
authors.lastname: Alù
keywords: metasurface; microwave; phase discontinuity; polarization