Terahertz Spectroscopy of Dilute Gases Using Bi2Sr2CaCu2O8+delta Intrinsic Josephson-Junction Stacks
Terahertz Spectroscopy of Dilute Gases Using Bi2Sr2CaCu2O8+delta Intrinsic Josephson-Junction Stacks
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使用 Bi2Sr2CaCu2O8 δ 本征约瑟夫森结堆栈对稀气体进行太赫兹光谱分析
DOI：
10.1103/physrevapplied.8.054005
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发表时间：
2017-11
影响因子：
4.6
通讯作者：
Xu W
中科院分区：
文献类型：
--
作者：
Sun Hancong;Yang Zhibao;Kinev Nickolay V.;Kiselev Oleg S.;Lv Yangyang;Huang Ya;Hao Luyao;Zhou Xianjing;Ji Min;Tu Xuecou;Zhang Caihong;Li Jun;Rudau Fabian;Wiel;Raphael;Hampp Johannes S.;Kizilaslan Olcay;Koelle Dieter;Jin Biaobing;Chen Jian;Kang Lin;Xu W
我们报道了利用(BSCCO)本征约瑟夫森结堆栈辐射的太赫兹波进行气体光谱探测的方法。发射频率通过改变流过的偏置电流从而改变发射极两端的电压来改变。对于太赫兹的探测，采用了测辐射和外差探测两种方法。用这两种检测方法都可以得到水和氨蒸气在太赫兹光谱上的明显吸收凹陷。在辐射热学方案下，我们获得了大约1 GHz的频率分辨率，这是使用太赫兹时域光谱系统的频率分辨率的数量级。使用更稳定的外差检测方案，最小可检测气体压力约为0.001微巴，约0.07微巴。可观察到的最小吸收线宽在4到5兆赫范围内。我们的结果表明，频率可调的BSCCO发射器可以作为潜在的太赫兹源，在大约0.4到2太赫兹的频率范围内应用于光谱学。
We report on spectrometric gas detection using terahertz waves radiated from(BSCCO) intrinsic Josephson-junction stacks. The emission frequency is varied by changing the bias current through and thus the voltage across the emitter. For the terahertz detection, both bolometric and heterodyne detection methods are employed. Clear absorption dips of water and ammonia vapor on the terahertz spectrum are obtained with both detection methods. With the bolometric scheme, we achieve a frequency resolution of about 1 GHz, which is on the order of the frequency resolution of systems employing terahertz time-domain spectroscopy. With the more stable heterodyne detection scheme, the minimum detectable gas pressure is around 0.001 mbar forand about 0.07 mbar for. The smallest observable absorption linewidths are in the range of 4 to 5 MHz. Our results suggest that the frequency-tunable BSCCO emitters can be convenient sources for potential terahertz applications in spectroscopy for frequencies between roughly 0.4 and 2 THz.