Josephson terahertz local oscillator
Josephson terahertz local oscillator
复制标题
约瑟夫森太赫兹本地振荡器
DOI：
10.1109/20.92553
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
R. Buhrman
中科院分区：
文献类型：
--
作者：
R. Robertazzi;R. Buhrman
电压可调约瑟夫森结太赫兹振荡器是使用坚固的高电流密度 NbN/sub 1-x/C/sub x/带有 M O 势垒的隧道结制造的。从这种结发射的辐射在芯片上由第二个约瑟夫森结检测到，该第二个约瑟夫森结与第一个约瑟夫森结电容耦合。对于临界电流密度为J/sub c/约3.5*10/sup 4/A/cm/sup 2/的振荡器结，该结以约=1.5mV的电压幅度振荡。检测到的 RF 电压电平从 300 GHz 到检测器上限 1 THz 以上保持基本恒定。根据检测器电流-电压特性中约瑟夫森阶跃高度的测量，可以确定振荡器结产生 0.5 μW 的太赫兹辐射，由于阻抗不匹配，其中 10 nW 耦合到检测器结中。 >
Voltage-tunable Josephson junction terahertz oscillators have been fabricated using rugged, high-current-density NbN/sub 1-x/C/sub x/ tunnel junctions with M O barriers. The radiation emitted from such junctions is detected on chip by a second Josephson junction which is capacitively coupled to the first. For oscillator junctions with a critical current density of J/sub c/ approximately 3.5*10/sup 4/ A/cm/sup 2/ the junction oscillates with a voltage amplitude of approximately=1.5 mV. The detected RF voltage level remain essentially constant from 300 GHz to above 1 THz, the upper limit of the detector. From measurements of the Josephson step height in the detector current-voltage characteristics, it is determined that the oscillator junction produces 0.5 mu W of terahertz radiation of which, due to impedance mismatch, 10 nW is coupled into the detector junction. >