报告题目 (Title)：Topological Photonic Integrated Circuits that Control the Internal Degrees of Freedom of Light（基于拓扑光子集成光路的光内部自由度调控）

报告人 (Speaker)：雨宮智宏 副教授（日本东京科学大学）

报告时间 (Time)：2025年6月16日（周一）10:30-12:00

报告地点 (Place)：校本部G601

邀请人(Inviter)：胡晓 教授

主办部门：量子科技研究院/理学院物理系

报告摘要：

Topological photonics, in which the topology of an electronic system is traced to a photon system, has received a great deal of attention in recent years because of its ability to manage optical signals with internal degrees of freedom, such as optical spin and orbital angular momentum, in optical circuits [1]. Optical circuits integrate various functions essential for optical communications on a single chip to achieve high processing speed and energy efficiency, but current optical circuits cannot handle even the internal degrees of freedom of photons themselves. In such a situation, if these can be controlled, it will be possible to make significant progress on various issues that are reaching their limits in the field of photonics.

Against this background, we have proposed to replace a part of Si photonic integrated circuits with a topological photonic system (TPICs; topological photonic integrated circuits) and have developed a series of topological passive elements for I/O, splitting/coupling on circuits [2-4]. In this talk, each of these elements will be discussed in detail.

[1] L.-H. Wu and X. Hu, Phys. Rev. Lett. 114, 223901 (2015).

[2] H. Kagami et al., Opt. Express 28, 33619 (2020).

[3] S. Okada et al., Opt. Express 31, 35218 (2023).

[4] X.-X. Wang et al., Phys. Rev. Research 7, 023067 (2025).