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本文介绍了利用钙钛矿型超导体BaPb_(0.7)Bi_(0.3)O_3(BPB)薄膜所制成的高灵敏光探测器。光信号在超导体能隙中产生准粒子和感应变化。通过沿BPB多晶薄膜晶粒界面所形成的隧道结可以测定这些变化。这种探测器在1~8μm波长范围内的灵敏度大约是10~4V/W,在1.3μm处发现直到1.3GHz的频率都可以响应。因此,BPB探测器用于红外分光光度计和光通信系统非常适合。
This paper presents a highly sensitive photodetector made of a perovskite type superconductor BaPb 0.7 Bi 0.3 O 3 (BPB) thin film. Optical signals produce quasi-particle and induced changes in the superconductor energy gap. These changes can be measured by tunnel junctions formed along the BPB polycrystalline film grain boundaries. The sensitivity of this detector in the wavelength range of 1 ~ 8μm is about 10 ~ 4V / W, 1.3μm found in the frequency up to 1.3GHz can respond. Therefore, BPB detectors are ideal for use in infrared spectrophotometers and optical communication systems.