NbTiN微带传输线的非线性和宽带参量放大
Nonlinearity and wideband parametric amplification in an NbTiN microstrip transmission line
摘要：
研究了电容分流NbTiN微带传输线中超导动态电感随电流变化的非线性响应。有人发现，每单位长度的一个微带线的电感可以改变高达20%，通过施加一个直流电流，对应于0.7 ns的单程时间延迟。为了研究非线性耗散，布拉格反射器被放置在这种类型的传输线的一段的两端，在一定频率范围内产生谐振。从谐振线宽和幅度随直流电流的变化，发现该线的无功响应与耗散响应的比率为788。低损耗使得这些传输线适合于微波和毫米波段的非线性光学过程的模拟的许多应用。作为一个例子，通过应用毫米波泵浦音调，在大约3和34 GHz之间观察到非常宽的频带参量放大。作为一个芯片上的毫米波傅里叶变换光谱仪的电流可变延迟线的使用也被认为是。
英文摘要：
The nonlinear response associated with the current dependence of the superconducting kinetic inductance was studied in capacitively shunted NbTiN microstrip transmission lines. It was found that the inductance per unit length of one microstrip line could be changed by up to 20% by applying a DC current, corresponding to a single pass time delay of 0.7 ns. To investigate nonlinear dissipation, Bragg reflectors were placed on either end of a section of this type of transmission line, creating resonances over a range of frequencies. From the change in the resonance linewidth and amplitude with DC current, the ratio of the reactive to the dissipative response of the line was found to be 788. The low dissipation makes these transmission lines suitable for a number of applications that are microwave and millimeter-wave band analogues of nonlinear optical processes. As an example, by applying a millimeter-wave pump tone, very wide band parametric amplification was observed between about 3 and 34 GHz. Use as a current variable delay line for an on-chip millimeter-wave Fourier transform spectrometer is also considered.
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