论文标题
超越复杂频率激发光散射的界限
Beyond Bounds on Light Scattering with Complex Frequency Excitations
论文作者
论文摘要
光散射是光学中最成熟的波浪现象之一，位于光 - 物质相互作用的核心，对纳米光的应用至关重要。被动性，因果关系和能源保存意味着对从小颗粒散射的控制程度严格界定，这对许多光学设备的性能产生了影响。在这里，我们证明可以通过在复杂频率下考虑激发来超越这些界限，从而产生极端散射响应，因为量身定制的纳米颗粒达到了准稳态状态。这些机制可用于设计超出常规限制的纳米结构的光散射，用于非侵入性传感，成像和纳米级的光操纵。
Light scattering is one of the most established wave phenomena in optics, lying at the heart of light-matter interactions and of crucial importance for nanophotonic applications. Passivity, causality and energy conservation imply strict bounds on the degree of control over scattering from small particles, with implications on the performance of many optical devices. Here, we demonstrate that these bounds can be surpassed by considering excitations at complex frequencies, yielding extreme scattering responses as tailored nanoparticles reach a quasi-steady-state regime. These mechanisms can be used to engineer light scattering of nanostructures beyond conventional limits for noninvasive sensing, imaging, and nanoscale light manipulation.
