团队工作High-speed electro-optic modulation in topological interface states of a one-dimensional lattice 被Light: Sicence & Applications期刊接收发表，该工作得到了国家重点研发计划（2019YFB2203601）、国家自然科学基金（62035016/61975115/61835008）的资助。上海交通大学PhotonMind团队联合兰州大学田永辉教授和中山大学董建文教授，通过研究基于氮化硅加载薄膜铌酸锂平台的一维拓扑边界态模式生成原理，提出一种基于一维拓扑晶格波导的超紧凑、低功耗、大带宽高速电光调制器。得益于一维拓扑晶格波导的强约束性和鲁棒性，该拓扑光子微腔的长度短，并且严格保持单模工作，避免了多模式控制的问题。实验结果表明，该高速电光调制器具有5.4 fJ/bit的超低能耗和104 GHz的大带宽，而长度仅为140 μm。
摘要：Electro-optic modulators are key components in data communication, microwave photonics, and quantum photonics. Modulation bandwidth, energy efficiency, and device dimension are crucial metrics of modulators. Here, we provide an important direction for the miniaturization of electro-optic modulators by reporting on ultracompact topological modulators. A topological interface state in a one-dimensional lattice is implemented on a thin film lithium niobate integrated platform. Due to the strong optical confinement of the interface state and the peaking enhancement of the electro-optic response, a topological cavity with a size of 1.6 × 140 μm2 enables a large modulation bandwidth of 104 GHz. The first topological modulator exhibits the most compact device size compared to reported LN modulators with bandwidths above 28 GHz, to the best of our knowledge. 100 Gb/s non-return-to-zero and 100 Gb/s four-level pulse amplitude modulation signals are generated. The switching energy is 5.4 fJ/bit, owing to the small electro-optic mode volume and low capacitance. The topological modulator accelerates the response time of topological photonic devices from the microsecond order to the picosecond order and provides an essential foundation for the implementation of large-scale lithium niobate photonic integrated circuits.