Author Affiliations
Abstract
1 Tianjin University, Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, and Key Laboratory of Optoelectronics Information and Technology, Tianjin, China
2 China University of Mining and Technology, School of Materials Science and Physics, Xuzhou, China
3 Guilin University of Electronic Technology, Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin, China
4 Oklahoma State University, School of Electrical and Computer Engineering, Stillwater, Oklahoma, United States
Valley topological photonic crystals (TPCs), which are robust against local disorders and structural defects, have attracted great research interest, from theoretical verification to technical applications. However, previous works mostly focused on the robustness of topologically protected edge states and little attention was paid to the importance of the photonic bandgaps (PBGs), which hinders the implementation of various multifrequency functional topological photonic devices. Here, by systematically studying the relationship between the degree of symmetry breaking and the working bandwidth of the edge states, we present spoof surface plasmon polariton valley TPCs with broadband edge states and engineered PBGs, where the operation frequency is easy to adjust. Furthermore, by connecting valley TPCs operating at different frequencies, a broadband multifunctional frequency-dependent topological photonic device with selectively directional light transmission is fabricated and experimentally demonstrated, achieving the functions of wavelength division multiplexing and add–drop multiplexing. We provide an effective and insightful method for building multi-frequency topological photonic devices.
multi-frequency topological device photonic valley Hall effect valley edge state photonic bandgap 
Advanced Photonics Nexus
2024, 3(3): 036004
Author Affiliations
Abstract
1 China University of Mining and Technology, School of Materials and Physics, Xuzhou, China
2 Southeast University, State Key Laboratory of Millimeter Waves, Nanjing, China
3 Soochow University, School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou, China
4 Soochow University, Institute for Advanced Study, Suzhou, China
The pseudo-magnetic field, an artificial synthetic gauge field, has attracted intense research interest in the classical wave system. The strong pseudo-magnetic field is realized in a two-dimensional photonic crystal (PhC) by introducing the uniaxial linear gradient deformation. The emergence of the pseudo-magnetic field leads to the quantization of Landau levels. The quantum-Hall-like edge states between adjacent Landau levels are observed in our designed experimental implementation. The combination of two reversed gradient PhCs gives rise to the spatially nonuniform pseudo-magnetic field. The propagation of the large-area edge state and the interesting phenomenon of the snake state induced by the nonuniform pseudo-magnetic field is experimentally demonstrated in a PhC heterostructure. This provides a good platform to manipulate the transport of electromagnetic waves and to design useful devices for information processing.
photonic crystal pseudo-magnetic field edge state snake state 
Advanced Photonics Nexus
2024, 3(2): 026011
徐炯 1,2臧小飞 1,2,*
作者单位
摘要
1 上海理工大学 上海市现代光学系统重点实验室,上海 200093
2 上海理工大学 光电信息与计算机工程学院,上海 200093
基于Kekulé晶格,验证了物质拓扑相与晶格原子间耦合作用之间的关系,研究了非厄米效应对拓扑绝缘体的影响。设计了两种格点增益损耗分布方式,分别说明了不同增益损耗对体态能谱、边缘态能谱的影响。随着增益损耗值的增大,体态能谱和边缘态能谱将经历能带间隙减小,能带在临界值处关闭形成狄拉克点,随后狄拉克点劈裂形成一对奇异点的过程。区别于传统对Kekulé晶格的研究,在保持系统胞内耦合作用相同的基础上,将胞间耦合作用分化为水平方向和垂直方向的两个量,分别进行调控,验证了拓扑边缘态能谱中能带间隙的有无不仅与几何边界相关,也受系统胞间耦合相互作用的调控。
Kekulé晶格 非厄米系统 拓扑边缘态 狄拉克点 Kekulé lattice non-Hermitian system topological edge state Dirac point 
光学仪器
2023, 45(3): 1
张金英 1,2,*王炳楠 1,**王瑞 1,***王鑫野 1
作者单位
摘要
1 精密光电测试仪器及技术北京市重点实验室,北京理工大学光电学院,北京 100081
2 北京理工大学长三角研究院,浙江 嘉兴 314001
谷赝自旋是构筑光学拓扑绝缘体的重要手段,其性质决定了光波拓扑传输特性。双波段能谷结构为同时调控多波段范围内的光波提供了重要平台。构筑了具有双波段能谷结构的光子晶体超胞,研究了zigzag型和armchair型界面在两个波段内拓扑边界态的传输特性及鲁棒性。结果表明:对于zigzag型界面,对称型界面与反对称型界面的光波传输特性差异显著,对称型界面允许平面波传输而反对称型界面大幅抑制平面波传输;而对于armchair型界面,对称型界面与反对称型界面的光波传输未表现出差异性。对于允许平面波传输的界面,无论是zigzag型还是armchair型界面均对杂质、缺陷、尖锐拐角等具有良好的鲁棒性。双波段拓扑边界态传输特性的系统性研究对于拓展光学拓扑绝缘体的应用空间具有重要价值。
材料 拓扑光子晶体 能谷结构 多波段 界面类型 拓扑边界态 
光学学报
2023, 43(9): 0916001
Author Affiliations
Abstract
1 School of Physics, State Key Lab for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, Collaborative Innovation Center of Quantum Matter, and Nano-optoelectronics Frontier Center of Ministry of Education, Peking University Yangtze Delta Institute of Optoelectronics, Peking University, Beijing 100871, China
2 National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
3 College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
4 Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong, the University of Hong Kong, Pokfulam Road, Hong Kong, China
Photonic topological insulators with robust boundary states can enable great applications for optical communication and quantum emission, such as unidirectional waveguide and single-mode laser. However, because of the diffraction limit of light, the physical insight of topological resonance remains unexplored in detail, like the dark line that exists with the crystalline symmetry-protected topological edge state. Here, we experimentally observe the dark line of the Z2 photonic topological insulator in the visible range by photoluminescence and specify its location by cathodoluminescence characterization, and elucidate its mechanism with the p-d orbital electromagnetic field distribution which calculated by numerical simulation. Our investigation provides a deeper understanding of Z2 topological edge states and may have great significance to the design of future on-chip topological devices.
photonic topological insulator edge state cathodoluminescence TMDC 
Opto-Electronic Advances
2022, 5(4): 210015
Author Affiliations
Abstract
1 School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
2 State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
Antichiral gyromagnetic photonic crystal (GPC) in a honeycomb lattice with the two interpenetrating triangular sublattices A and B magnetically biased in opposite directions can realize antichiral one-way edge states propagating along the same direction at its two parallel edges. Here, we report the construction and observation of topological beam splitting with the easily adjustable right-to-left ratio in an antichiral GPC. The splitter is compact and configurable, has high transmission efficiency, and allows for multi-channel utilization, crosstalk-proof, and robust against defects and obstacles. This magnificent performance is attributed to the peculiar property that antichiral one-way edge states exist only at zigzag edge but not at armchair edge of antichiral GPC. When we combine two rectangular antichiral GPCs holding left- and right-propagating antichiral one-way edge states respectively, bidirectionally radiating one-way edge states at two parallel zigzag edges can be achieved. Our observations can enrich the understanding of fundamental physics and expand topological photonic applications.
topological photonics one-way edge state photonic crystal beam splitting topological materials 
Opto-Electronic Science
2022, 1(5): 220001
作者单位
摘要
1 电子科技大学光电科学与工程学院,四川 成都 610054
2 电子科技大学长三角研究院,浙江 湖州 313001

近几年,拓扑光子晶体凭借独特的传播性能受到研究人员的广泛关注,随着理论模型的逐步成熟,拓扑光子学领域出现了一些新型应用。利用拓扑光子晶体形成的边缘态,设计具有单向传导能力、光路增强效应的光电子器件,这些器件会具有对局域缺陷的免疫、高传输效率等性质,在芯片开发、生物传感、**通信等领域具有很广泛的应用前景。以在不同维度上拓扑光子晶体形成边缘的理论模型为基础,对目前已开发的光学器件,如拓扑激光器、光波导、单向传导器件、光调制器等,进行了分类总结与分析,展现出拓扑光子晶体在结构设计和材料选取上的巨大潜能。最后在明确目前拓扑光子晶体研究进展的基础上,对拓扑光子学器件在设计过程中存在的缺陷、优化方向进行评估与展望。

光学器件 光子晶体 拓扑光子学 边缘态 
激光与光电子学进展
2022, 59(1): 0100001
作者单位
摘要
中国科学院物理研究所,北京 100190
随着拓扑光子学的发展,对缺陷、微扰等具有鲁棒性的拓扑边缘态、拓扑角态的发现革新了半导体激光器,并且推动了拓扑激光器的发展。首先,回顾了近几年拓扑激光器的发展历程,以及不同拓扑激光器的原理;其次,分析了各类拓扑激光器的最新实现,并且解释了拓扑边缘态、拓扑角态的基础物理。在这些实验中,拓扑激光器的模式是由介质结构决定,并通过光学增益来激发激光。分析表明拓扑角态相比于拓扑边缘态具有强局域性、小模式体积,因此基于拓扑角态的拓扑激光器更高效,阈值更低,这为未来的光子集成芯片提供了可能;最后,展望了拓扑激光器面临挑战和潜在的应用方向,有助于探索更实用的拓扑激光器。
拓扑光子学 拓扑边缘态 拓扑角态 拓扑激光器 topological photonic topological edge state topological corner state topological laser 
红外与激光工程
2021, 50(11): 20210506
刘慧 1王好南 1谢博阳 1程化 1,*[ ... ]陈树琪 1,2,3,*
作者单位
摘要
1 南开大学 物理科学学院,泰达应用物理研究院,弱光非线性光子学教育部重点实验室,天津 300071
2 山西大学 极端光学协同创新中心,山西太原 030006
3 山东师范大学 光场调控及应用协同创新中心,济南 250358
受凝聚态拓扑绝缘体研究的启发,整数量子霍尔效应、量子自旋霍尔效应、拓扑半金属、高阶拓扑绝缘体等拓扑物理相继在光学系统中实现。光子系统因能带干净,样品设计简单且制作精度高等优势,逐渐成为研究物理拓扑模型和新型拓扑效应的重要平台。拓扑光子学提供了全新的调控光场和操控光子的方法,其拓扑保护的边界态可实现光子对材料杂质缺陷免疫的传播,这种传统光子系统不具备的理想的传输态有望驱动新型光学集成器件的变革。本文将从二维光学体系出发,简要介绍几种典型的光拓扑绝缘体的最新进展,例如光整数量子霍尔效应、光量子自旋霍尔效应、光Floquet拓扑绝缘体、拓扑安德森绝缘体和高阶拓扑绝缘体。文中重点介绍了上述几种光拓扑绝缘体的拓扑模型及其新型的拓扑现象,并在最后展望了新型光学拓扑效应及其在光学器件中的应用前景。
光拓扑绝缘体 光整数量子霍尔效应 光量子自旋霍尔效应 光Floquet拓扑绝缘体 拓扑安德森绝缘体 高阶拓扑绝缘体 拓扑保护边缘态 photonic topological insulators photonic integer quantum Hall effect photonic quantum spin Hall effect photonic Floquet topological insulators topological Anderson insulators photonic higher order topological insulators topological protected edge state 
中国光学
2021, 14(4): 935
作者单位
摘要
闽南师范大学, 物理与电子信息工程学院 福建 漳州 363000
量子Hall体是一种拓扑绝缘态, 它内部绝缘, 边缘导电, 存在单向导电、零电阻的边缘态。边缘态的存在, 从本质上来说是电子的磁矩与动量耦合的结果, 受到拓扑结构保护。在强磁场下, 电子的磁矩只能取一种方向, 因此边缘态电子只能沿一个方向运动, 不能往后散射。本文从一维定向移动格点系统的哈密顿量出发, 讨论了量子霍尔体系边缘态电子的低能激发和势垒散射, 得到能量本征态与本征值。研究表明: 边缘态电子的能谱是线性的, 量子隧穿概率为1, 与势垒的高度无关, 不会被散射, 电阻为零。
量子霍尔效应, 边缘态, 零电阻 quantum Hall effect edge state zero resistance 
量子光学学报
2021, 27(2): 163

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