论文标题
用可调的跨表面的波前形状：在任意频率下创建冷点和连贯的完美吸收
Wavefront Shaping with a Tunable Metasurface: Creating Coldspots and Coherent Perfect Absorption at Arbitrary Frequencies
论文作者
论文摘要
现代电子系统在复杂的电磁环境中运行，必须处理噪声和不需要的耦合。在任何实际应用中，至关重要的是隔离或拒绝不需要信号来减轻漏洞的能力。在这项工作中，我们描述了（i）控制电磁腔内传播的波浪的空间自由度的使用，并证明了在选定端口之间的传输系数中创建nulls的能力； （ii）创建一个相干完美吸收的条件。这两个目标均以任意频率执行。在第一种情况下，提出了一种新颖有效的优化算法，该算法有选择地在单个频带上或在多个频段上同时生成冷点。我们表明，该算法成功使用了多个输入端口配置和不同的优化带宽。在第二种情况下，我们确定如何使用该技术来建立多端口相干的完美吸收状态。
Modern electronic systems operate in complex electromagnetic environments and must handle noise and unwanted coupling. The capability to isolate or reject unwanted signals for mitigating vulnerabilities is critical in any practical application. In this work, we describe the use of a binary programmable metasurface to (i) control the spatial degrees of freedom for waves propagating inside an electromagnetic cavity and demonstrate the ability to create nulls in the transmission coefficient between selected ports; and (ii) create the conditions for coherent perfect absorption. Both objectives are performed at arbitrary frequencies. In the first case a novel and effective optimization algorithm is presented that selectively generates coldspots over a single frequency band or simultaneously over multiple frequency bands. We show that this algorithm is successful with multiple input port configurations and varying optimization bandwidths. In the second case we establish how this technique can be used to establish a multi-port coherent perfect absorption state for the cavity.
