论文标题
抑制高动电感超导co-Planar波导的辐射损失
Suppression of radiation loss in high kinetic inductance superconducting co-planar waveguides
论文作者
论文摘要
我们提出了一种新型的实验室芯片技术，以测量（亚）MM波长的超导传输线中非常低的损耗。芯片由100 nm厚的NBTIN Coplanar波导（CPW）Fabry Perot（FP）谐振器组成，一侧与天线耦合，另一侧与微波动力学电感探测器耦合。使用单个频率辐射源使我们能够测量FP在350 GHz左右的频率响应并推断出损耗。我们表明，损失是由CPW线内部的辐射损失主导的，该辐射损失形成FP，并且随着线宽度的降低和增加的动力电感而减小。可以使用十四行诗模拟来定量理解结果。观察到的最低损失是CPW的总宽度为$ 6 \ \ MATHRM {μm} $，并且对应于$ \ $ \ 15,000 $的Q-因子。
We present a novel lab-on-chip technique to measure the very low losses in superconducting transmission lines at (sub-) mm wavelengths. The chips consist of a 100 nm thick NbTiN Coplanar Waveguide (CPW) Fabry Perot (FP) resonator, coupled on one side to an antenna and on the other side to a Microwave Kinetic Inductance detector. Using a single frequency radiation source allows us to measure the frequency response of the FP around 350 GHz and deduce its losses. We show that the loss is dominated by radiation loss inside the CPW line that forms the FP and that it decreases with decreasing line width and increasing kinetic inductance as expected. The results can be quantitatively understood using SONNET simulations. The lowest loss is observed for a CPW with a total width of $6\ \mathrm{μm}$ and corresponds to a Q-factor of $\approx15,000$.
