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一、原理简述应用准光学亚毫米波检测系统观察远红外激光失稳行为要注重器件的灵敏度和快速响应二方面性能参数。肖特基势垒的特点是半导体内电的输运过程主要是热激发的多数载流子,不存在与少数载流子注入有关的恢复时间和电荷存贮效应,因此能提高器件的频率响应。在二极管两端馈以偏压时,其伏安特性曲线正向斜率陡峭,串联电阻低,反向漏电流很小。利用二极管正向非线性电导能在信号激励下产生高灵敏的响应率。系统的接收灵敏度除了取决于混频器以外,还取决于入射束信号与混频器天线方向图耦合和混频器触丝天线在工作频率时的阻抗与肖特基势垒二极管的阻抗匹配。入射束与混频器天线方向图耦合效率可定义为混频器天线所能接收到的功率W_A与入射束功率W_1之比,即
First, the principle of brief application of sub-millimeter-wave optical detection system to observe the far-infrared laser instability behavior should focus on the sensitivity of the device and rapid response of the two performance parameters. Schottky barrier is characterized by semiconductor internal electrical transport process is mainly thermally excited majority of carriers, there is no minority carrier injection related recovery time and charge storage effect, and thus can improve the frequency response of the device . When biased at both ends of the diode, the positive slope of the volt-ampere characteristic curve is steep, the series resistance is low, and the reverse leakage current is small. The use of diode forward nonlinear electrical conductivity in the signal excitation to produce a highly sensitive response rate. The reception sensitivity of the system depends not only on the mixer, but also on the coupling of the incident beam signal with the mixer antenna pattern and the impedance of the mixer's contact antenna at the operating frequency with that of the Schottky barrier diode. The coupling efficiency between the incident beam and the mixer antenna pattern can be defined as the ratio of the power W_A received by the mixer antenna to the power of the incident beam W_1