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Three Quanta Sensitivity Superconductor–Insulator–Superconductor Mixer for the 0.78–0.95 THz Band.

Authors :
Kojima, Takafumi
Kroug, Matthias
Takeda, Masanori
Uzawa, Yoshinori
Shan, Wenlei
Fujii, Yasunori
Wang, Zhen
Ogawa, Hideo
Source :
Applied Physics Express; Oct2009, Vol. 2 Issue 10, p1-1, 1p
Publication Year :
2009

Abstract

We have successfully demonstrated a low-noise 0.78–0.95-THz waveguide mixer based on Nb/AlO<subscript>x</subscript>/Nb superconductor–insulator–superconductor (SIS) junctions integrated with an NbTiN/SiO<subscript>2</subscript>/Al superconducting inverted microstrip. The mixer employs a twin-junction tuning circuit and an impedance transformer which are designed to achieve both low noise and wideband operation. Corrected for optical input losses in front of the mixer, the double-sideband (DSB) noise temperature is below 120 K (<3 hf/k<subscript>B</subscript>) around the local oscillator (LO) frequency of 0.88 THz and at an operating temperature of 2 K. The results represent state-of-the-art performance for mixers in the terahertz frequency range. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
18820778
Volume :
2
Issue :
10
Database :
Complementary Index
Journal :
Applied Physics Express
Publication Type :
Academic Journal
Accession number :
100161801
Full Text :
https://doi.org/10.1143/APEX.2.102201