Left- and right-handed transmission peaks near the magnetic resonance frequency in composite metamaterials
Left- and right-handed transmission peaks near the magnetic resonance frequency in composite metamaterials
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DOI：
10.1103/physrevb.70.201101
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发表时间：
2004-11-01
影响因子：
3.7
通讯作者：
Soukoulis, CM
中科院分区：
文献类型：
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作者：
Katsarakis, N;Koschny, T;Soukoulis, CM
我们介绍了在同一介质板上或在交替板上对由开环谐振器(SRR)和导线组成的复合材料(CMM)的自由空间微波测量。我们的实验结果驳斥了人们普遍认为的观点，即在SRR和导线的阻带内出现CMM透射峰是左撇子行为的明显证明。这种想法是基于这样的假设，即仅有SRR和导线的阻带不受两者同时存在的影响。我们在这里表明这个假设是错误的：CMM的有效等离子体频率omega(P)(‘)实际上大大低于仅导线的等离子体频率omega(P)；此外，与离面情况相反，面内导线将SRR的磁共振频率omega(M)推高到CMM的较高值omega(M)(’)。我们得出结论，决定通过坐标测量机的透射谱中的峰是否真的是左手的标准是峰位于omega(M)(‘)之上和omega(P)(’)之下。我们的结果为实验识别omega(P)(‘)提供了一种明确的方法。
We present free-space microwave measurements on composite metamaterials (CMMs) consisting of split ring resonators (SRRs) and wires either on the same dielectric board or on alternating boards. Our experimental results disprove the widely held belief that the occurrence of a CMM transmission peak within the stop bands of the SRRs alone and wires alone constitutes a clear demonstration of left-handed (LH) behavior. This belief is based on the assumption that the stop bands of SRRs alone and wires alone are not affected by the simultaneous presence of both. We show here that this assumption is wrong: The effective plasma frequency, omega(p)('), of the CMM is actually substantially lower than the wires-only plasma frequency, omega(p); furthermore, the in-plane wires, as opposed to the off-plane case, push the magnetic resonance frequency of the SRRs, omega(m), to a higher value, omega(m)('), for the CMM. We conclude that the criterion for deciding whether a peak in the transmission spectrum through a CMM is really left-handed is for the peak to be located above omega(m)(') and below omega(p)('). Our results provide a definite way for experimentally identifying omega(p)(').