Non-Hermitian Control of Topological Scattering Singularities Emerging from Bound States in the Continuum,Laser & Photonics Reviews

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Non-Hermitian Control of Topological Scattering Singularities Emerging from Bound States in the Continuum
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2023-03-17 , DOI: 10.1002/lpor.202200308
Zarko Sakotic _{1,

2} , Predrag Stankovic ₂ , Vesna Bengin ₂ , Alex Krasnok ₃ , Andrea Alú _{4,

5} , Nikolina Jankovic ₂

Affiliation

Leveraging topological properties in the response of electromagnetic systems can greatly enhance their potential. Although the investigation of singularity-based electromagnetics and non-Hermitian electronics has considerably increased in recent years in the context of various scattering anomalies, their topological properties have not been fully assessed. In this work, it is theoretically and experimentally demonstrated that non-Hermitian perturbations around bound states in the continuum can lead to singularities of the scattering matrix, which are topologically nontrivial and comply with charge conservation. The associated scattering matrix poles, zeros, and pole-zero pairs delineate extreme scattering events, including lasing, coherent perfect absorption, and absorber-lasers. The presented framework enables a recipe for generation, annihilation, and addition of these singularities in electric circuits, with potential for extreme scattering engineering across a broad range of the electromagnetic spectrum for sensing, wireless power and information transfer, polarization control, and thermal emission devices.

中文翻译：

连续体中束缚态出现的拓扑散射奇点的非厄尔米特控制

在电磁系统的响应中利用拓扑特性可以极大地增强它们的潜力。尽管近年来在各种散射异常的背景下对基于奇点的电磁学和非厄米电子学的研究有了相当大的增加，但它们的拓扑特性尚未得到充分评估。在这项工作中，从理论上和实验上证明，连续体中束缚态周围的非厄米特扰动会导致散射矩阵的奇异性，这在拓扑上是不平凡的并且符合电荷守恒。相关的散射矩阵极点、零点和零极点对描绘了极端散射事件，包括激光、相干完美吸收和吸收激光。所呈现的框架支持生成配方，

更新日期：2023-03-17

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