A 230-GHz Endfire SIS Mixer With Near Quantum-Limited Performance
A 230-GHz Endfire SIS Mixer With Near Quantum-Limited Performance
复制标题
具有接近量子限制性能的 230 GHz Endfire SIS 混频器
DOI:
10.1109/lmwc.2022.3190701
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发表时间:
2022
影响因子:
3
通讯作者:
Garrett J
中科院分区:
文献类型:
--
作者:
Garrett J
In this letter, we report the near quantum-limited performance of a 230 GHz endfire superconductor-insulator-superconductor (SIS) mixer utilizing a Nb/Al-AlOx/Nb trilayer. An important feature of this mixer is its use of a unilateral finline for the waveguide-to-planar circuit transition, which allows for a wide radiofrequency (RF) bandwidth, a simple waveguide structure with easy alignment, and for the mixer chip to be aligned along the optical axis. Each of these factors is beneficial in the construction of large-format focal plane arrays. We tested the new finline mixer from 210 to 260 GHz in a liquid helium cryostat at ~4 K. The best recorded noise temperature was approximately twice the quantum limit, which is comparable to conventional radial probe mixers. This suggests that endfire SIS mixers can be used in large format arrays, comprising 100s or even 1000s of SIS mixing elements, while retaining state-of-the-art quantum mixing performance.
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