具有狄拉克δ型超定向辐射的暗超吸收体
Dark Superabsorbers with Dirac-delta-like superdirective radiation
AI总结：
本文揭示在特定消光截面和角动量通道条件下，散射系统可实现吸收最大、散射最小并呈现狄拉克δ型远场辐射，提出暗超吸收体概念，并指出其在能量收集、低可见性接收和超定向光与物质相互作用等领域的应用潜力。
摘要：
我们从理论和数值上揭示，在给定的消光截面水平下，且当确定角动量通道占主导时，存在一个物理极限：吸收截面达到最大，而散射截面达到最小。此外，任何在此条件下工作的散射系统都会伴随一种针状狄拉克δ型远场辐射图样，其效果是除前向方向外几乎不扰动背景场。因此，我们将这一结果称为暗超吸收体。进一步地，通过考虑数学上的吉布斯现象，我们发现即使能够恰当地设计在此类条件下工作的散射体，也仍然无法获得完全等价的狄拉克δ型远场辐射。我们相信这一发现对暗能量收集、低可见性接收器、超定向光与物质相互作用以及菲涅耳衍射成像的设计具有潜在应用价值。
英文摘要：
We theoretically and numerically reveal that under a given level of extinction cross section and with definite angular momentum channels dominant, there exists a physical limitation for absorption cross section being maximum and scattering cross section being minimum. In addition, any scattering systems operated at this condition would be accompanied by a needle Dirac-delta-like far-field radiation pattern, reducing to perturb the background field except in the forward direction. We therefore refer to this outcome as dark superabsorbers. Moreover, by considering the mathematical Gibbs phenomenon, we find that a completely equivalent Dirac-delta far-field radiation is excluded even we could properly design the scatterers operated at such conditions. We believe this finding has potential applications in design of dark energy harvesting, lower-visibility receivers, superdirective light-matter interaction, and Fresnel diffractive imaging.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
