title: Plasmonics metalens independent from the incident polarizations.
abstract: An ultra-thin, planar, broadband metalens composed of L-shaped gap antennas on a thin gold film has been designed, which is suitable for both circular and X/Y linear polarizations focusing simultaneously. The phase discontinuity of the cross-polarized transmisson light can be manipulated by the length and width of the L-shaped gap antenna accurately. The designed planar metalens posses a strong focusing ability over a large wavelength range, and the size of the focus spot is in sub-wavelength scale. The focal lengths change from 13 to 7 um with incident wavelength from 750 to 1300 nm, and the cause of dispersion is explained and analyzed in detail. The designed metalens can work very well at a wide incident angles of 0~45°. Most importantly, its unique focusing ability that is independent of the incident polarizations will greatly promotes the practical applications and developments of the metasurfaces.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Zhongyi
authors.initials: Z
authors.lastname: Guo
authors.forename: Rongzhen
authors.initials: R
authors.lastname: Li
authors.forename: Jingran
authors.initials: J
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Xinshun
authors.initials: X
authors.lastname: Wang
authors.forename: Shiliang
authors.initials: S
authors.lastname: Qu