具有或不具有隐对称性的复杂散射系统中的完全吸收
Perfect Absorption in Complex Scattering Systems with or without Hidden Symmetries
摘要：
用于弱损耗目标中的有效能量沉积的波前成形（WFS）方案是与下一代电信、远程无线功率传输和电磁战相关的许多经典波技术的持续挑战。在许多情况下，这些目标嵌入在缺乏任何类型（几何或隐藏）对称性的复杂外壳内，例如复杂网络，建筑物或船只，其中多个干扰路径的超敏感性挑战了WFS协议的可行性。我们证明了一个新的和一般的WFS计划的成功，相干完美吸收（CPA）电磁协议的基础上，通过利用网络的耦合传输线与复杂的连接，强制执行的几何对称性的情况下。我们的平台允许通过磁场控制网络内部的局部损耗和违反时间反演对称性;从而建立CPA超越其最初的概念作为激光腔的时间反演，同时提供了一个机会，通过实施半经典工具更好地了解CPA的形成。
英文摘要：
Wavefront shaping (WFS) schemes for efficient energy deposition in weakly lossy targets is an ongoing challenge for many classical wave technologies relevant to next-generation telecommunications, long-range wireless power transfer, and electromagnetic warfare. In many circumstances these targets are embedded inside complicated enclosures which lack any type of (geometric or hidden) symmetry, such as complex networks, buildings, or vessels, where the hypersensitive nature of multiple interference paths challenges the viability of WFS protocols. We demonstrate the success of a new and general WFS scheme, based on coherent perfect absorption (CPA) electromagnetic protocols, by utilizing a network of coupled transmission lines with complex connectivity that enforces the absence of geometric symmetries. Our platform allows for control of the local losses inside the network and of the violation of time-reversal symmetry via a magnetic field; thus establishing CPA beyond its initial concept as the time-reversal of a laser cavity, while offering an opportunity for better insight into CPA formation via the implementation of semiclassical tools.
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