用于射频的小型化超导超材料
Miniaturized Superconducting Metamaterials for Radio Frequencies
摘要：
我们已经开发出一种低损耗、超小型射频$(RF)$超材料，工作频率为$\sim$ 76 MHz。这种小型化介质由直径与$\sim$ $λ$ /658（$λ$是自由空间波长）一样小的平面螺旋元件组成，由石英衬底上的Nb薄膜制成。传输数据进行检查以下和以上的超导转变温度的Nb为一个单一的螺旋和一维阵列。设计的有效性进行了测试，通过数值模拟和良好的协议是found. We讨论如何超导体使这样一个紧凑的设计在$RF$高负载品质因数（超过5000），这实际上是很难实现与普通金属。
英文摘要：
We have developed a low-loss, ultra-small radio frequency $(RF)$ metamaterial operating at $\sim$76 MHz. This miniaturized medium is made up of planar spiral elements with diameter as small as $\sim$$λ$/658 ($λ$ is the free space wavelength), fashioned from Nb thin films on quartz substrates. The transmission data are examined below and above the superconducting transition temperature of Nb for both a single spiral and a one dimensional array. The validity of the design is tested through numerical simulations and good agreement is found. We discuss how superconductors enable such a compact design in the $RF$ with high loaded-quality factor (in excess of 5000), which is in fact difficult to realize with ordinary metals.
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