Tunable terahertz emission from the intrinsic Josephson junctions in acute isosceles triangular Bi2Sr2CaCu2O8+δ mesas
Tunable terahertz emission from the intrinsic Josephson junctions in acute isosceles triangular Bi2Sr2CaCu2O8+δ mesas
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DOI：
10.1364/oe.21.002171
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发表时间：
2013-01-28
期刊：
影响因子：
3.8
通讯作者：
Kadowaki, K.
中科院分区：
文献类型：
--
作者：
Delfanazari, K.;Asai, H.;Kadowaki, K.
为了确定梅萨的几何形状是否可能影响从高温超导体Bi 2Sr 2CaCu 2 O 8 + δ单晶构造的台面中的本征约瑟夫森结发射的相干太赫兹（THz）辐射的性质，我们研究了三角形台面。对于等边三角形台面，所观察到的发射被发现限于单梅萨TM（1，0）模式。然而，在0.495至0.934太赫兹的范围内的可调谐辐射被发现产生从一个尖锐的等腰三角形梅萨。该47%的可调谐性是从任何几何形状的这种台面的外部电流-电压特性分支观察到的最宽的。虽然在可调谐范围内的几个频率的辐射似乎已被腔共振增强，大多数频率是远离这样的共振频率，只能归因于交流约瑟夫森效应。(C)2013年美国光学学会
In order to determine if the mesa geometry might affect the properties of the coherent terahertz (THz) radiation emitted from the intrinsic Josephson junctions in mesas constructed from single crystals of the high-temperature superconductor, Bi2Sr2CaCu2O8+delta, we studied triangular mesas. For equilateral triangular mesas, the observed emission was found to be limited to the single mesa TM(1,0) mode. However, tunable radiation over the range from 0.495 to 0.934 THz was found to arise from an acute isosceles triangular mesa. This 47% tunability is the widest yet observed from the outer current-voltage characteristic branch of such mesas of any geometry. Although the radiation at a few of the frequencies in the tunable range appear to have been enhanced by cavity resonances, most frequencies are far from such resonance frequencies, and can only be attributed to the ac-Josephson effect. (C) 2013 Optical Society of America