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Orbital Angular Momentum Multiplexing and Demultiplexing by a Single Metasurface

Author(s): Li, Y (Li, Yang); Li, X (Li, Xiong); Chen, LW (Chen, Lianwei); Pu, MB (Pu, Mingbo); Jin, JJ (Jin, Jinjin); Hong, MH (Hong, Minghui); Luo, XG (Luo, Xiangang)
Source: ADVANCED OPTICAL MATERIALS  Volume: 5  Issue: 2  Article Number: UNSP 1600502  DOI: 10.1002/adom.201600502  Published: JAN 2017 
Abstract: Orbital angular momentum (OAM) has recently gained much interest in high-speed optical communication due to its spatial orthogonality. However, complex spatial phase distributions of OAM make the components difficult for nano-photonic integration. In this work, a method to multiplex and demultiplex multiple OAMs, wavelengths, and polarizations channels by a highly integrated off-axis technique on a metasurface is presented. As a multiplexer, beams without OAM can be transferred into coaxial beams carrying different OAM features by different incident angles; as a demultiplexer, coaxial beams carrying multi-OAMs can be divided into different directions with fundamental modes. Furthermore, the component based on dipole optical antenna metasurface can be used not only as an OAM multiplexer/demultiplexer but also as a multiplexer/demultiplexer to achieve wavelength division multiplexing and polarization-division multiplexing, as both these applications are based on the conservations of momentum and angular momentum. For practical applications, phase-only hologram is analyzed to demonstrate multiple functions of this method.
IDS Number: EJ4PS
ISSN: 2195-1071

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