Optimized Catenary Metasurface for Detecting Spin and Orbital Angular Momentum via Momentum Transformation

Theoretically, the topological charge l in the vortex can be any integer or fraction, thus the vortex carrying different topological charges can form an infinitely orthogonal orbital angular momentum state space, which can provide new dimensional resources for optical communication. However, high-ca...

Full description

Saved in:
Bibliographic Details
Published inApplied sciences Vol. 13; no. 5; p. 3237
Main Authors Fu, Guoquan, Chen, Siran, He, Qiong, Xiong, Lingxing, Wen, Yifeng, Zhang, Fei, Lu, Yuran, Guo, Yinghui, Pu, Mingbo, Luo, Xiangang
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2023
Subjects
Angular momentum
Catenaries
Design
Electron beams
Integrated optics
large mode detection
Metasurfaces
Optical communication
optimized streamlined metasurface
orbital angular momentum
photon momentum transformation
Topology
vortex recognition
Vortices
Wave fronts
China
Online AccessGet full text

Cover

More Information
Summary:Theoretically, the topological charge l in the vortex can be any integer or fraction, thus the vortex carrying different topological charges can form an infinitely orthogonal orbital angular momentum state space, which can provide new dimensional resources for optical communication. However, high-capacity optical communication requires low delay, thus real-time detection of the OAM is significant for communication. Metasurfaces have the characteristics of low loss, ultra-thin, easy integration, and flexible phase controls, which provide a meaningful way to realize integrated OAM generation and detection. Here, an optimized streamlined metasurface (OSM) is presented, which can detect high-order vortex beams in a single, simple, and rapid manner by photon momentum transformation (PMT). Since different vortices are converted into focusing modes with distinct azimuthal coordinates on a transverse plane through PMT, a single measurement can determine OAMs in an ample mode space. In addition, the OSM can detect more and higher order OAMs compared with a discrete metasurface (DM) at the same size, due to its better wavefront sampling capabilities. With the merits of an ultra-compact device size, simple optical structure, and outstanding vortex recognition ability, our approach may underpin the development of integrated optics and quantum systems.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13053237