发表机构
University of Southern Denmark; University of Graz; Karlsruhe Institute of Technology（南丹麦大学; 格拉茨大学; 卡尔斯鲁厄理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过表面响应形式体系研究等离激元异质二聚体的量子效应，发现局域源可独立探测各粒子响应，为极端等离激元光-物质相互作用提供新见解。
AI 中文摘要
我们利用扩展源（平面波）和局域源（点偶极子和电子束）探测等离激元异质二聚体的量子响应。基于Feibelman参数实现表面响应形式体系，我们研究了纳米球异质二聚体，其中一个粒子具有电子内溢（spill-in）特征，而另一个具有电子外溢（spill-out）特征。我们识别出两种作用方向相反的量子表面修正（分别导致光谱红移和蓝移）可以相互抵消的情形，从而产生与局域响应近似预测无异的介观光谱。一旦引入局域源，这一图景发生显著变化，使得能够独立地选择性探测各粒子的量子响应。这种探测在电子束情形下表现为高阶模式的激发，而在点偶极子源情形下则覆盖完整的模式景观。该描述为极端等离激元架构中光-物质相互作用的机制提供了新见解，并为理解和调控等离激元-量子发射体架构开辟了新视角。
英文摘要
We probe the quantum response of plasmonic heterodimers with extended (plane waves) and localized (point dipoles and electron beams) sources. Implementing the surface-response formalism based on Feibelman parameters, we explore nanosphere heterodimers where one particle is characterized by electron spill-in, while the other by spill-out. We identify situations where the two quantum surface corrections that act in opposite spectral-shift directions can cancel out, producing mesoscopic spectra that do not differ from the predictions of the local-response approximation. This picture changes dramatically once localized sources are implemented, allowing one to selectively probe the quantum response of the particles independently. Such probing occurs in terms of higher-order modes in the case of electron beams, or for the complete modal landscape in the case of point dipole sources. This description offers a new insight into the mechanisms governing light--matter interactions in extreme plasmonic architectures, and opens new perspectives for the understanding and tailoring of plasmonic--quantum emitter architectures.
