Open AccessPlasmonics metalens independent from the incident polarizations
Author(s) -
Wei Wang,
Zhongyi Guo,
Rongzhen Li,
Jingran Zhang,
Yan Li,
Yi Liu,
Xinshun Wang,
Shiliang Qu
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.016782
Subject(s) - optics , wavelength , planar , ray , broadband , plasmon , physics , polarization (electrochemistry) , metamaterial , materials science , optoelectronics , computer science , chemistry , computer graphics (images)
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.