Structured light fields embody strong spatial variations of polarisation, phase and amplitude. Understanding, characterization and exploitation of such fields can be achieved through their topological properties. Three-dimensional (3D) topological solitons, such as hopfions, are 3D localized continuous field configurations with nontrivial particle-like structures, that exhibit a host of important topologically protected properties. Here, we propose and demonstrate photonic counterparts of hopfions with exact characteristics of Hopf fibration, Hopf index, and Hopf mapping from real-space vector beams to homotopic hyperspheres representing polarisation states. We experimentally generate photonic hopfions with on-demand high-order Hopf indices and independently controlled topological textures, including Néel-, Bloch-, and anti-skyrmionic types. We also demonstrate a robust free-space transport of photonic hopfions, thus, showing potential of hopfions for developing optical topological informatics and communications.
Photonic torons, topological phase transition and tunable spin monopoles
Harbin University of Science and Technology（哈尔滨理工大学）；Nanyang Technological University（南洋理工大学）；National University of Singapore（新加坡国立大学）；Stanford University（斯坦福大学）
High-dimensional Supermode Photonics Enabled by Hierarchical Supersymmetric Transformation
State Key Lab of Photonics and Communications, Department of Electronic Engineering, Shanghai Jiao Tong University（上海交通大学电子工程系光子与通信国家重点实验室）；School of Microelectronics Science and Technology, Sun Yat-Sen University（中山大学微电子科学与技术学院）；Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)（南方海洋科学与工程广东省实验室（珠海））；Photonics Research Institute, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University（香港理工大学电子及信息工程学系光子学研究所）
Optoelectronic Physical Unclonable Functions and Reservoir-Inspired Computation with Low Symmetry Integrated Photonics
Clemson University（克莱姆森大学）；Florida Polytechnic University（佛罗里达理工学院）；Tufts University（塔夫茨大学）；The University of British Columbia（不列颠哥伦比亚大学）；University of North Carolina at Charlotte（北卡罗来纳大学夏洛特分校）
Integrated Supermode Photonics Enabled by Supersymmetric Transformation
State Key Lab of Photonics and Communications, Department of Electronic Engineering, Shanghai Jiao Tong University（上海交通大学电子工程系光子与通信国家重点实验室）；School of Microelectronics Science and Technology, Sun Yat-Sen University（中山大学微电子科学与技术学院）；Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)（南方海洋科学与工程广东省实验室（珠海））；Photonics Research Institute, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University（香港理工大学电子及信息工程学系光子学研究所）
Universal free-space photonic circuits for polarized structured light
Università degli Studi di Napoli Federico II（那不勒斯费德里科二世大学）；Università di Pavia（帕维亚大学）；Istituto Nazionale di Fisica Nucleare, Sezione di Pavia（意大利国家核物理研究所帕维亚分部）
Extraction of optical Bloch modes in a photonic-crystal waveguide
我们在光子晶体波导上进行相敏近场扫描光学显微镜。观察到的复杂的场模式进行了分析，通过空间傅里叶变换，揭示了几个指导TE和TM的模式。使用Ha等人提出的重建算法（Opt. Lett. 34（2009）），我们将测量的二维场图案分解为传播布洛赫模式的叠加。这为研究近场测量中的特定模式开辟了新的可能性。我们应用该方法研究了类TE导模的横向行为，当接近带边时，该导模在周围的光子晶体中延伸得更深。
Hardware-Efficient Universal Linear Transformations for Optical Modes in the Synthetic Time Dimension
Department of Electrical and Computer Engineering, University of Maryland（马里兰大学电气与计算机工程系）；Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland（马里兰大学电子与应用物理研究所及联合量子研究所）；James C. Wyant College of Optical Sciences, University of Arizona（亚利桑那大学詹姆斯·C·怀安特光学科学学院）
High-Speed Non-Volatile Barium Titanate Field Programmable Photonic Gate Array
Photonics Research Labs, iTEAM Research Institute, Universitat Politècnica de València（巴伦西亚理工大学iTEAM研究所光子学实验室）；iPronics Programmable Photonics S.L.（iPronics可编程光子有限公司）；Lumiphase AG（Lumiphase股份公司）；University of West Attica（西阿提卡大学）；CEA-Leti（法国原子能与替代能源委员会LETI研究所）
Topological Engineering of High-Order Exceptional Points through Transformation Optics
Nanyang Technological University（南洋理工大学）；Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University（南洋理工大学物理与数学学院颠覆性光子技术研究中心）；National Key Laboratory of Microwave Photonics, Nanjing University of Aeronautics and Astronautics（南京航空航天大学微波光子学国家重点实验室）
