Open AccessHelicity-switched hologram utilizing a polarization-free multi-bit coding metasurface
Author(s) -
Chunlong Guan,
Xumin Ding,
Zhuochao Wang,
Kuang Zhang,
Minghe Jin,
Shah Nawaz Burokur,
Qun Wu
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.400274
Subject(s) - optics , polarization (electrochemistry) , holography , circular polarization , physics , helicity , wavefront , geometric phase , polarization controller , microwave , laser , microstrip , fiber laser , chemistry , particle physics , quantum mechanics
In this work, a polarization-free coding metasurface is proposed to manipulate circularly polarized waves. Compared to a Pancharatnam-Berry phase metasurface, the proposed design not only allows for overcoming anti-symmetrical response characteristics between orthogonal circularly polarized states to enable achieving identical functionality under both right-handed and left-handed circularly polarized wave illuminations and avoiding polarization-conversion losses but also offers additional degree of freedom in the control of handedness. As a proof-of-concept demonstration, a polarization-free multi-bit coding metasurface is designed to realize helicity-switched holograms in the microwave region. Experimental measurements performed on a fabricated prototype reveal outstanding imaging quality with extremely high imaging efficiency above 76% for arbitrary polarizations at 10 GHz. Our proposed method expands the route in manipulating circularly polarized waves and can be applied over the whole electromagnetic spectrum for wavefront manipulation.