当前位置: X-MOL 学术Light Sci. Appl. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Direct quantification of topological protection in symmetry-protected photonic edge states at telecom wavelengths
Light: Science & Applications ( IF 19.4 ) Pub Date : 2021-01-06 , DOI: 10.1038/s41377-020-00458-6
Sonakshi Arora 1 , Thomas Bauer 1 , René Barczyk 2 , Ewold Verhagen 2 , L Kuipers 1
Affiliation  

Topological on-chip photonics based on tailored photonic crystals (PhCs) that emulate quantum valley-Hall effects has recently gained widespread interest owing to its promise of robust unidirectional transport of classical and quantum information. We present a direct quantitative evaluation of topological photonic edge eigenstates and their transport properties in the telecom wavelength range using phase-resolved near-field optical microscopy. Experimentally visualizing the detailed sub-wavelength structure of these modes propagating along the interface between two topologically non-trivial mirror-symmetric lattices allows us to map their dispersion relation and differentiate between the contributions of several higher-order Bloch harmonics. Selective probing of forward- and backward-propagating modes as defined by their phase velocities enables direct quantification of topological robustness. Studying near-field propagation in controlled defects allows us to extract upper limits of topological protection in on-chip photonic systems in comparison with conventional PhC waveguides. We find that protected edge states are two orders of magnitude more robust than modes of conventional PhC waveguides. This direct experimental quantification of topological robustness comprises a crucial step toward the application of topologically protected guiding in integrated photonics, allowing for unprecedented error-free photonic quantum networks.



中文翻译:

电信波长对称保护光子边缘态拓扑保护的直接量化

基于模拟量子谷霍尔效应的定制光子晶体(PhC)的拓扑片上光子学由于其有望实现经典和量子信息的稳健单向传输而最近引起了广泛的兴趣。我们使用相位分辨近场光学显微镜对拓扑光子边缘本征态及其在电信波长范围内的传输特性进行了直接定量评估。通过实验可视化沿着两个拓扑非平凡镜面对称晶格之间的界面传播的这些模式的详细亚波长结构,我们可以绘制它们的色散关系,并区分几个高阶布洛赫谐波的贡献。对由相速度定义的前向和后向传播模式进行选择性探测可以直接量化拓扑鲁棒性。研究受控缺陷中的近场传播使我们能够与传统的光子晶体波导相比,提取片上光子系统拓扑保护的上限。我们发现受保护的边缘态比传统光子晶体波导的模式稳健两个数量级。这种拓扑鲁棒性的直接实验量化是在集成光子学中应用拓扑保护引导的关键一步,从而实现前所未有的无差错光子量子网络。

更新日期:2021-01-06
down
wechat
bug