Improved Nb SIS devices for heterodyne mixers between 700 GHz and 1.3 THz with NbTiN transmission lines using a normal metal energy relaxation layer
نویسندگان
چکیده
1.3 THz with NbTiN transmission lines using a normal metal energy relaxation layer M. P. Westig, S. Selig, K. Jacobs, T. M. Klapwijk, and C. E. Honingh K€ olner Observatorium f€ ur Submillimeter Astronomie (KOSMA), I. Physikalisches Institut, Universit€ at zu K€ oln, Z€ ulpicher Straße 77, D-50937 K€ oln, Germany Kavli Institute of NanoScience, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
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Waveguide SIS mixers are presented in which Nb/Al-AlOx/Nb tunnel junctions are integrated with both NbTiN/SiO2/NbTiN and NbTiN/SiO2/Al tuning circuits. The mixers with a NbTiN/SiO2/NbTiN tuning circuit yield relatively low receiver noise temperatures between 700 and 830 GHz, but their sensitivity drops significantly above ~ 850 GHz. In contrast, low-noise heterodyne mixing near 1 THz is observe...
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