Generation of Continuously Variable-mode Orbital Angular Momentum Beams

Jianchun Xu,1,4

Lihao Chen,1

Xiaojun Zhai, 2

Ru Zhang, 1,3

Klaus D. Mcdonald-Maier, 2

Shanguo Huang 1

Ke Bi 1,4,*, Email

1 State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China

2 School of Computer Science and Electronic Engineering, University of Essex, Colchester CO4 3SQ, United Kingdom

3 Beijing Key Laboratory of Space-ground Interconnection and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China

4 Beijing University of Posts and Telecommunications Research Institute, Shenzhen 518057, China

Abstract

Orbital angular momentum (OAM) beam emitters with compact structure and high performance are highly desirable for wireless communication and radar technology. Here, we propose a compact emitter that only consists of a ring resonator and a feed line. Continuously-variable-mode OAM beams are generated by adjusting the wavelength and transmission path. The basic design principle and specific evaluation index are discussed. Both the simulated and experimental results demonstrate that the proposed emitter obtains the capacity of generating variable-modes. This approach opens a way for designing novel OAM beam emitter with desired properties.

Generation of Continuously Variable-mode Orbital Angular Momentum Beams