论文部分内容阅读
本文利用超导氮化铌(NbN)热电子测辐射热计(HEB)结合自行开发的傅里叶变换光谱仪(FTS)来实现太赫兹(THz)脉冲信号的快速直接检测.该检测器采用易调控的微波来驱动超导NbNHEB芯片,使其偏置在直接检测的最佳工作点(测得的噪声等效功率为:8×10~(-12)W/(Hz)~(1/2)).通过与用同样灵敏度的商用低温半导体测辐射热计(Bolometer)测量到的THz量子级联激光器(QCL)辐射谱的结果进行比较,表明我们初步构建的基于超导NbNHEB直接检测器的系统已具有与商用Bolometer检测器同等的性能.
In this paper, a direct and direct THz pulsed signal is detected by using a NbN thermoelectron thermometer (HEB) combined with a self-developed Fourier transform spectrometer (FTS) The controlled microwaves drive the superconducting NbNHEB chip to be biased at the optimum operating point for direct detection (the measured noise equivalent power is 8 × 10 ~ (-12) W / (Hz) ~ (1/2 ) .Compared with the results of the THz quantum cascade laser (QCL) emission spectrum measured with the same sensitivity commercial low-temperature semiconductor bolometer, it shows that our preliminary construction based on the superconducting NbNHEB direct detector The system already has the same performance as a commercial Bolometer detector.