Open AccessAll-dielectric metasurface grating for on-chip multi-channel orbital angular momentum generation and detection
Author(s) -
Jiguo Wang,
Zengkai Shao,
Wen Yan,
Xiaodong Qiu,
Yujie Chen,
Yanfeng Zhang,
Siyuan Yu,
Lixiang Chen
Publication year - 2019
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.27.018794
Subject(s) - angular momentum , optical vortex , optics , physics , grating , photonics , orbital angular momentum of light , polarization (electrochemistry) , quantum channel , quantum , optoelectronics , quantum information , beam (structure) , total angular momentum quantum number , quantum mechanics , chemistry
Optical vortices, carrying quantized orbital angular momentum (OAM) states, have been widely investigated because of their promising applications in both classical and quantum realms. Among these applications, efficient generation and measurement of OAM beams are critical. Current techniques available for generating OAM beams generally suffer from bulky size, low operation efficiency, or single-function or complicated fabrication processes. Here we propose and experimentally demonstrate an approach to generate arbitrary optical vortices with a chip-scale device based on all-dielectric two-dimensional (2D) polarization-independent metasurface grating. Based on multi-beam interference in principle and nanofabrication techniques for implementation, our device allows efficient and simultaneous on-chip generation of multi-channel beams with different OAM. We further demonstrate that our device can also work reversely in detecting the OAM spectrum of various pure and mixed optical vortices (e.g., fractional OAM orders) with low crosstalk. Our scheme may find potential applications in developing new integrated photonics for OAM-based high-dimensional quantum information processing in future quantum network.