Study on unidirectional-emitting photonic-crystal lasers based on topological photonics

基于拓扑光子学的单向发射光子晶体激光器研究

• 批准号: 21F20356
• 负责人: 野田 進
• 金额: $ 1.54万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-28 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21F20356/
• 关键词: Photonic crystal; Topology; Resonance

In 2022 year, first, I continued to improve the theory about the unidirectional guided resonances (UGRs). I established a new topological interpretation of UGRs in parameter space, which is consistent with the conventional topological charge picture, but may better clarify the physical origins and dynamic evolution of UGRs. Comparing to conventional topological charges picture, with this new interpretation, it's convenient to construct UGRs in parameter space, and their interplay with other radiation singularities in parameter space, such as exceptional points (EPs) and conventional band degeneracy is also discussed. Based on these, I updated the paper pre-printed in arXiv, and now it has been accepted by Physical Review Letter (Phys. Rev. Lett. 130, 056401)Second, I found that, this topological physical interpretation of UGRs actually can also be applied to other amplitudes singularities in photonic crystals. For example, it can be used to describe the Bound states in continuum (BICs). Following the same strategy, I established a universal picture of BICs in whole momentum space. It is found that the definition of BICs can be extended even outside the lightcone, and all tunable BICs are actually resulted from the interband coupling of band inversion, including the accidental BICs and F-W BICs.

在2022年，首先，我继续完善了单向引导共振（ugr）的理论。我在参数空间中建立了一种新的ugr拓扑解释，与传统的拓扑电荷图一致，但可以更好地阐明ugr的物理起源和动态演化。与传统的拓扑电荷图相比，利用这种新的解释，可以方便地在参数空间中构造ugr，并讨论了它们与参数空间中其他辐射奇点的相互作用，如异常点（EPs）和常规带简并。在此基础上，我更新了预印在arXiv上的论文，目前已被Physical Review Letter （Phys）接受。其次，我发现，这种对ugr的拓扑物理解释实际上也可以应用于光子晶体中的其他振幅奇点。例如，它可以用来描述连续体中的束缚态（bic）。按照同样的策略，我在整个动量空间中建立了bic的通用图像。研究发现，光锥的定义甚至可以扩展到光锥外，所有可调谐的光锥实际上都是由带反转的带间耦合产生的，包括偶然的光锥和F-W光锥。

项目成果

Analytical theory of finite-size photonic crystal slabs near the band edge

• DOI: 10.1364/oe.455074
• 发表时间: 2022-04-25
• 期刊: OPTICS EXPRESS
• 影响因子: 3.8
• 作者: Chen, Zihao;Yin, Xuefan;Peng, Chao
• 通讯作者: Peng, Chao

Observation of intensity flattened phase shifting enabled by unidirectional guided resonance

• DOI: 10.1515/nanoph-2021-0393
• 发表时间: 2021-11
• 期刊: Nanophotonics
• 影响因子: 7.5
• 作者: Zixuan Zhang;Xuefan Yin;Zihao Chen;Feifan Wang;Weiwei Hu;Chao Peng

北京大学(中国)

北京大学（中国）

Observation of miniaturized bound states in the continuum with ultra-high quality factors

• DOI: 10.1016/j.scib.2021.10.020
• 发表时间: 2022-02-17
• 期刊: SCIENCE BULLETIN
• 影响因子: 18.9
• 作者: Chen, Zihao;Yin, Xuefan;Peng, Chao
• 通讯作者: Peng, Chao