Open AccessAchromatic electromagnetic metasurface for generating a vortex wave with orbital angular momentum (OAM)
Author(s) -
Shan Jiang,
Chang Chen,
Hualiang Zhang,
Weidong Chen
Publication year - 2018
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.26.006466
Subject(s) - angular momentum , physics , optics , achromatic lens , optical vortex , vortex , orbital angular momentum of light , orbital angular momentum multiplexing , electromagnetic radiation , bandwidth (computing) , plane wave , polarization (electrochemistry) , total angular momentum quantum number , telecommunications , computer science , classical mechanics , chemistry , thermodynamics
The vortex wave that carries orbital angular momentum has attracted much attention due to the fact that it can provide an extra degree of freedom for optical communication, imaging and other applications. In spite of this, the method of OAM generation at high frequency still suffers from limitations, such as chromatic aberration and low efficiency. In this paper, an azimuthally symmetric electromagnetic metasurface with wide bandwidth is designed, fabricated and experimentally demonstrated to efficiently convert a left-handed (right-handed) circularly polarized incident plane wave (with a spin angular momentum (SAM) of ћ) to a right-handed (left-handed) circularly polarized vortex wave with OAM. The design methodology based on the field equivalence principle is discussed in detail. The simulation and measurement results confirm that the proposed method provides an effective way for generating OAM-carrying vortex wave with comparative performance across a broad bandwidth.