人工局域磁振子共振超散射体
Super Scatterers Based on Artificial Localized Magnon Resonances
摘要：
电磁波与物体之间的相互作用受到物体形状和材料成分的强烈影响。通过亚波长结构化它们的晶胞形成的牺牲产生的材料，即超材料，可以表现出对电磁辐射的特殊响应，并为散射体设计提供额外的强大自由度。特别是，负材料磁化率会引起与深亚波长粒子的强烈共振相互作用。虽然天然贵金属的负介电常数在局部等离子体共振振荡中表现出来，但负磁导率实际上在自然界中不存在。在这里，人工磁振子共振的概念，在亚波长的对象与有效的负磁导率，设计的超材料的方法的基础上，证明。形成球体的开口环谐振器阵列内的磁场的强局部振荡在结构的集体模式中杂交。其结果是，非常高的散射截面，超过了四个数量级的相同半径的钢球，被证明。此外，基于亚波长超材料的球体的散射截面被示出为与大型军用飞机的低频（MHz）雷达特征相当。超级散射体基于人工创造的材料内的可调谐共振，可以在广泛的电磁应用中找到用途，包括无线通信，雷达，RFID，物联网硬件和许多其他应用。
英文摘要：
The interaction between electromagnetic waves and objects is strongly affected by the shape and material composition of the latter. Artificially created materials, formed by a subwavelength structuring of their unit cells, namely metamaterials, can exhibit peculiar responses to electromagnetic radiation and provide additional powerful degrees of freedom to the scatterer design. In particular, negative material susceptibilities give rise to strong resonant interactions with deeply subwavelength particles. While the negative electrical permittivity of natural noble metals manifests itself in localized plasmon resonant oscillations, negative magnetic permeability is virtually non-existent in nature. Here the concept of artificial magnon resonance in subwavelength objects with effective negative permeability, designed based on the metamaterial approach, is demonstrated. Strong localized oscillations of the magnetic fields within an array of split ring resonators, forming a sphere, hybridize in a collective mode of the structure. As a result, extremely high scattering cross section, exceeding that of a steel sphere with the same radius by four orders of magnitude, was demonstrated. Furthermore, the scattering cross section of subwavelength metamaterial-based sphere was shown to be comparable to the low frequency (MHz) radar signature of a big military aircraft. Super scatterers, based on tunable resonances within artificially created materials, can find use in a broad range of electromagnetic applications, including wireless communications, radars, RFID, internet of things hardware and many others.
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。
