论文标题
用于广角吸收的大周期多通道元
Large-Period Multichannel Metagratings For Broad-Angle Absorption
论文作者
论文摘要
我们提出了一种替代方案，用于在平面复合材料中获得有效的功率耗散，从而扩展了最近提出的Metagration（MGS）概念，可极化颗粒（元原子）的稀疏排列以实现多功能吸收器。与典型的元面解决方案相反，在典型的跨表面溶液中，周期性最多仅限于波长的一半，以避免高阶floquet-bloch模式，我们故意考虑了大周期MGS，依靠其可靠的能力有效减轻伪装散射。因此，通过精确的工程来实施吸收过程，该工程在扩大时期的许多单个散射器之间的相互耦合之间实现，这些额外的自由度进一步用于实施同时的多个激发角度的完美吸收条件。最终的设备利用标准的印刷电路板配置，以半差为单位获得，同时以松弛的制造需求获得，在宽角度范围内表现出高吸收，可用于雷达横截面还原和能量收集应用。
We present an alternative scheme for obtaining effective power dissipation in planar composites, extending the recently proposed concept of metagrating (MGs), sparse arrangements of polarizable particles (meta-atoms), to realize multifunctional absorbers. In contrast to typical metasurface solutions, where periodicities are limited to half of a wavelength at most to avoid high-order Floquet-Bloch modes, we purposely consider large-period MGs, relying on their proven ability to effectively mitigate spurious scattering. The absorption process is thus implemented via precise engineering of the mutual coupling between numerous individual scatterers fitting in the enlarged period, with these additional degrees of freedom further utilized to enforce the perfect absorption conditions for multiple excitation angles simultaneously. The resultant devices, utilizing a standard printed circuit board configuration obtained semianalytically while featuring relaxed fabrication demands, exhibit high absorption across a wide angular range, useful for radar cross section reduction and energy harvesting applications.
