Optical Orbital Angular Momentum
The concept of optical orbital angular momentum (OAM) drives the birth and fast development of many breakthrough technologies. This special collection on optical OAM presents articles published in Advanced Photonics and Advanced Photonics Nexus on this topic.
Image credit: Zhangjiang Lab, from the cover of Advanced Photonics Volume 5, Issue 3
Optical vortices in communication systems: mode (de)modulation, processing, and transmission 
Shuqing Chen, Jiafu Chen, Tian Xia, Zhenwei Xie, Zebin Huang, Haolin Zhou, Jie Liu, Yujie Chen, Ying Li, Siyuan Yu, Dianyuan Fan, and Xiaocong Yuan
Terahertz vortices with tunable topological charges from a laser–plasma channel
Linzheng Wang, Yanping Chen, Chen Wang, Huanyu Song, Jinyu Hua, Rong Huang, Min Chen, Jie Zhang, and Zhengming Sheng
Achieving high-security and massive-capacity optical communications based on orbital angular momentum configured chaotic laser
Yanwei Cui, Jianguo Zhang, Zhongquan Nie, Anbang Wang, and Yuncai Wang
Iso-propagation vortices with OAM-independent size and divergence toward future faster optical communications
Wenxiang Yan, Zhaozhong Chen, Xian Long, Yuan Gao, Zheng Yuan, Zhi-Cheng Ren, Xi-Lin Wang, Jianping Ding, and Hui-Tian Wang
Integrated coherent beam combining system for orbital-angular-momentum shift-keying-based free-space optical links
Bowang Shu, Yuqiu Zhang, Hongxiang Chang, Shiqing Tang, Jinyong Leng, and Pu Zhou
Light correcting light with nonlinear optics
Sachleen Singh, Bereneice Sephton, Wagner Tavares Buono, Vincenzo D’Ambrosio, Thomas Konrad, and Andrew Forbes
Generation of time-varying orbital angular momentum beams with space-time-coding digital metasurface
Jingxin Zhang, Peixing Li, Ray C. C. Cheung, Alex M. H. Wong, and Jensen Li
Orbital angular momentum based intra- and interparticle entangled states generated via a quantum dot source
Alessia Suprano, Danilo Zia, Mathias Pont, Taira Giordani, Giovanni Rodari, Mauro Valeri, Bruno Piccirillo, Gonzalo Carvacho, Nicolò Spagnolo, Pascale Senellart, Lorenzo Marrucci, and Fabio Sciarrino
Optical Orbital Angular Momentum: Thirty Years and Counting (editorial)
Guixin Li, Junsuk Rho, and Xiao-Cong Yuan
Torsion pendulum driven by the angular momentum of light: Beth’s legacy continues
Etienne Brasselet
Commentary: Advent of torsional optomechanics from Beth’s legacy
Jaehyuck Jang, Jungho Mun, and Junsuk Rho
Generation of time-varying orbital angular momentum beams with space-time-coding digital metasurface
Jingxin Zhang, Peixing Li, Ray C. C. Cheung, Alex M. H. Wong, and Jensen Li
Propagation of transverse photonic orbital angular momentum through few-mode fiber
Qian Cao, Zhuo Chen, Chong Zhang, Andy C. Chong, and Qiwen Zhan
Tailoring light on three-dimensional photonic chips: a platform for versatile OAM mode optical interconnects
Jue Wang, Chengkun Cai, Feng Cui, Min Yang, Yize Liang, and Jian Wang
Single-shot Kramers–Kronig complex orbital angular momentum spectrum retrieval
Zhongzheng Lin, Jianqi Hu, Yujie Chen, Camille-Sophie Brès, and Siyuan Yu
Self-seeded free-electron lasers with orbital angular momentum
Jiawei Yan and Gianluca Geloni
Reconfigurable structured light generation and its coupling to air–core fiber
Yize Liang, Hongya Wang, Xi Zhang, Jianzhou Ai, Zelin Ma, Siddharth Ramachandran, and Jian Wang
Multiparameter encrypted orbital angular momentum multiplexed holography based on multiramp helicoconical beams
Nian Zhang, Baoxing Xiong, Xiang Zhang, and Xiao Yuan
Characteristics of a Gaussian focus embedded within spiral patterns in common-path interferometry with phase apertures
Yizhou Tan and Ying Gu
Generation of high-efficiency, high-purity, and broadband Laguerre-Gaussian modes from a Janus optical parametric oscillator
Dunzhao Wei, Pengcheng Chen, Yipeng Zhang, Wenzhe Yao, Rui Ni, Xiaopeng Hu, Xinjie Lv, Shining N. Zhu, Min Xiao, and Yong Zhang
