Terahertz Waves Emission From Two Bi2Sr2CaCu2O8 Mesas in Series
Terahertz Waves Emission From Two Bi2Sr2CaCu2O8 Mesas in Series
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两个串联 Bi2Sr2CaCu2O8 台面的太赫兹波发射
DOI：
10.1109/tthz.2015.2402571
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发表时间：
2015
影响因子：
3.2
通讯作者：
Wang Huabing
中科院分区：
文献类型：
--
作者：
Wang Pei;He Ming;Wu Hao;Ji Min;Zhou Xianjing;Zhao XinJie;Hatano Takeshi;Wang Huabing
本文研究了Bi2Sr2CaCu2O8(BSCCO)系列介质层厚度对太赫兹(THz)辐射功率的影响。提出了一种由两个BSCCO台面串联而成的本征约瑟夫森结阵列。测量了不同厚度的台面的电流-电压特性、太赫兹发射的功率和傅里叶谱。实验结果表明，THz辐射功率随台面厚度的增加而增大。当厚度为0.502 nm时，功率达到最大值，约为0.502μW，频率为0.708太赫兹。但是，随着台面厚度的增加，THz辐射功率减小。太赫兹辐射功率与台面厚度之间的这种非线性是由于台面的腔谐振和台面中的IJJ产生的自加热所致。串联两个台面的结构可以扩展成多个串联台面的IJJ阵列，从而进一步提高太赫兹辐射功率。
The dependence of terahertz (THz) emission power on the thickness of series Bi2Sr2CaCu2O8(BSCCO) mesas is studied in this letter. An intrinsic Josephson junction (IJJ) array with two BSCCO mesas in series is proposed. The current-voltage characteristics of the IJJs, the powers, and Fourier spectra of the THz emission are measured for different thicknesses of the mesas, which is gradually mounted by the argon ion beam milling. Experiment results indicate that the THz emission power grows as the thickness of the mesas is increasing. The power reaches a maximum value of about 0.502 μW at a frequency of 0.708 THz when the thickness is 1200 nm. However, the THz emission power decreases while the thickness of the mesas keeps increasing. This nonlinearity between the THz emission power and the thickness of the mesas is due to the cavity resonance of the mesas and the self-heating generated by the IJJs in the mesas. The structure of connecting two mesas in series can be extended to form an IJJ array of multiple series mesas, which could further improve the THz emission power.