Bandwidth Limitations of Nb/AlN/Nb SIS Mixers Around 700 GHz

Lodewijk, CFJ; Zijlstra T.; Zhu, SJ; Mena, FP; Baryshev, AM; Klapwijk, TM


We study, using niobium-technology, the bandwidth of SIS mixers operating at frequencies close to the energy-gap frequency. Microstriplines of niobium-silicon dioxide-niobium have different properties for the top and bottom superconductor, which we find to depend on the used fabrication process. Replacing the AlO x tunnel barrier by AlN, the bandwidth increases by 53%. The measurements, using a Fourier Transform Spectrometer (FTS) and performed in ambient air, demonstrate that the bandwidth is no longer limited by the tuning circuit but by the atmospheric absorption of radiation. Excellent noise temperatures are found over a full band of 600 to 720 GHz. © 2009 IEEE.

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Título según WOS: Bandwidth Limitations of Nb/AlN/Nb SIS Mixers Around 700 GHz
Título según SCOPUS: Bandwidth limitations of Nb/AlN/Nb SIS mixers around 700 GHz
Título de la Revista: IEEE Transactions on Applied Superconductivity
Volumen: 19
Número: 3
Editorial: Institute of Electrical and Electronics Engineers Inc.
Fecha de publicación: 2009
Página de inicio: 395
Página final: 399
Idioma: eng