发表机构
Zhejiang University; Vienna University of Technology (TU Wien)（浙江大学; 维也纳工业大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过加权叠加实频率响应合成复频率人工极点，从理论和实验上实现了零前向 Kerker 散射，为非厄米光-物质相互作用及非侵入式传感成像提供了新途径。
AI 中文摘要
所有被光照亮的物体都不可避免地会投下阴影——这是一个普遍现象，其核心在于所有被动系统在平面波照射下都具有非零的前向散射振幅这一基本特性。自 Kerker 1983 年具有里程碑意义的论文发表以来，人们投入了大量努力来克服这一限制并实现前向散射的消除，这一目标如今广为人知为零前向 Kerker 散射。然而，这一目标从根本上仅限于主动系统，要求材料具有物理增益或激发源具有虚拟增益。尽管主动材料科学和非厄米光子学取得了进展，零前向 Kerker 散射的实验实现仍然是一个未解决的挑战。在此，我们从理论和实验两方面展示了如何通过易于获取的实频率响应的加权叠加来有效合成零前向 Kerker 散射。我们的合成方案基于在复频率处创建一个人工极点，该极点胜过固有的散射极点。这些发现不仅为非厄米光-物质相互作用提供了一个现实的实验框架，而且对非侵入式传感和成像具有技术相关性。
英文摘要
All objects illuminated with light inevitably cast a shadow -- a universal phenomenon encapsulated in the fundamental property that all passive systems with plane-wave illumination feature a non-zero forward scattering amplitude. Since Kerker's landmark 1983 paper, considerable effort has been devoted to overcoming this limitation and achieving the elimination of forward scattering -- an objective now widely known as the zero-forward Kerker scattering. However, this objective is fundamentally restricted to active systems, requiring either physical gain in materials or virtual gain in the excitation source. Despite advances in active materials science and non-Hermitian photonics, the experimental realization of zero-forward Kerker scattering still remains an open challenge. Here, we show, both theoretically and experimentally, how zero-forward Kerker scattering can be effectively synthesized by a weighted superposition of readily accessible real-frequency responses. Our synthetic recipe builds on creating an artificial pole at a complex frequency that prevails over inherent scattering poles. These findings not only unlock a realistic experimental framework for non-Hermitian light-matter interactions, but also hold technological relevance for non-invasive sensing and imaging.
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