Integrated Submm Wave Receiver: Development and Applications

DOI: 10.1007/978-3-642-20158-5_10 In book: Fundamentals of Superconducting Nanoelectronics, Publisher: Springer-Verlag Berlin Heidelberg, Editors: Anatolie Sidorenko, pp.263-296


A superconducting integrated receiver (SIR) comprises in a single chip a planar antenna combined with a superconductor-insulator-superconductor (SIS) mixer, a superconducting Flux Flow Oscillator (FFO) acting as a Local Oscillator (LO) and a second SIS harmonic mixer (HM) for the FFO phase locking. In this report, an overview of the SIR and FFO developments and optimizations is presented. Improving on the fully Nb-based SIR we have developed and studied Nb-AlN-NbN circuits, which exhibit an extended operation frequency range. Continuous tuning of the phase locked frequency has been experimentally demonstrated at any frequency in the range 350-750GHz. The FFO free-running linewidth has been measured between 1 and 5MHz, which allows to phase lock up to 97% of the emitted FFO power. The output power of the FFO is sufficient to pump the matched SIS mixer. Therefore, it is concluded that the Nb-AlN-NbN FFOs are mature enough for practical applications.

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