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arXiv 0807.4585cond-mat.mtrl-sci
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垂直入射下三维裂环谐振器中一种新的磁响应的观测

Observation of a New Magnetic Response in 3-Dimensional Split Ring Resonators under Normal Incidence

S. Y. Chiam, A. A. Bettiol, M. Bahou, J. Han, H. O. Moser, F. Watt

摘要:

到目前为止,超材料领域的研究主要是用平面二维结构阵列进行的。在这里,我们报告了一个新发现的磁共振分裂圆柱谐振器(SCR),一个三维版本的分裂环谐振器(SRR),这是制造与质子束写入技术。实验和数值计算结果表明,迄今为止未观察到的3维共振模式下的正常入射约26太赫兹,当SCR深度约为自由空间波长的一半。这种模式的特点是强大的电流沿圆柱轴,集中在圆柱间隙。由于它们的方向,这些轴向电流在垂直入射下引起磁响应,这在浅SRR中是不可能的。我们的研究结果揭示了新的行为在SRR结构中,这是由于其纵横比的变化。这种新的共振可能对寻求实用的三维超材料产生重大影响。

英文摘要:

So far, research in the field of metamaterials has been carried out largely with arrays of flat, 2-dimensional structures. Here, we report a newly identified magnetic resonance in Split Cylinder Resonators (SCRs), a 3-dimensional version of the Split Ring Resonator (SRR), which were fabricated with the Proton Beam Writing technique. Experimental and numerical results indicate a hitherto unobserved 3-dimensional resonance mode under normal incidence at about 26 THz, when the SCR depth is approximately half the free space wavelength. This mode is characterized by strong currents along the cylinder axis which are concentrated at the cylinder gaps. Due to their orientation, these axial currents give rise to a magnetic response under normal incidence, which is not possible in shallow SRRs. Our results reveal new behavior in the SRR structure which arises from a change in its aspect ratio. Such new resonances can have a significant influence on the quest for practical, 3-dimensional metamaterials.

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