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Superconductive parallel junctions arrays for Submm-wave local oscillator applications

Faouzi M. Boussaha, Morvan C. Salez, Jean-Guy Caputo, L. Loukitch, M. Chaubet

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

We are developing Submillimiter-wave fully Integrated superconducting Receivers (SIRs) based on SIS mixer and SIS Multijunction operating as local oscillator. In deed, Multijunctionbased FFOs may be an interesting alternative to LJJ-based FFOs in SIRs, allowing wide LO tunability, wide impedance matching bandwidths, and increased design flexibility and control of technological parameters. In this paper, we will present a numerical study of the Josephson electrodynamics in this kind of device and measurement results of output power from 5 junction array with current density of ~ 10 kA/cm2 at submm-wave frequencies. 18th International Symposium on Space Terahertz Technology

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Nov 3, 2010•19 citations
We are developing Submillimiter-wave fully Integrated superconducting Receivers (SIRs) based on SIS mixer and SIS Multijunction operating as local oscillator. In deed, Multijunctionbased FFOs may be an interesting alternative to LJJ-based FFOs in SIRs, allowing wide LO tunability, wide impedance matching bandwidths, and increased design flexibility and control of technological parameters. In this paper, we will present a numerical study of the Josephson electrodynamics in this kind of device and measurement results of output power from 5 junction array with current density of ~ 10 kA/cm2 at submm-wave frequencies. 18th International Symposium on Space Terahertz Technology
The concept of the fully Superconducting Integrated Receiver (SIR) has been developed and experimentally demonstrated. The single-chip submm wave receiver includes a planar antenna integrated with a SIS mixer, which is pumped by an internal superconducting Flux Flow Oscillator (FFO) as local oscillator (LO). A DSB noise temperature below 100 K has been demonstrated around 500 GHz. Heterodyne measurements have shown that the instantaneous bandwidth of the receiver is 15 – 20 % which meets the requirements of practical applications. The double-dipole lens-antenna SIS mixer has an antenna beam ≈ f/9 with sidelobes below- 16 dB. This enables an efficient coupling of the SIR to the telescope antenna. With the FFO phase locked in the frequency range 270- 440 GHz a linewidth as low as 1 Hz has been measured relative to a reference oscillator. A compact array of 9 SIRs has been developed and tested. Each pixel contains an internally pumped receiver chip, which is mounted on the back of an elliptical silicon lens. A noise temperature of about 150 K has been measured at 500 GHz using the internal FFO for the imaging array of Integrated Receivers.
The concept of a fully superconducting integrated receiver is developed and experimentally tested. This single-chip sub-mm wave receiver includes a planar antenna integrated with a SIS mixer and an internal superconducting Josephson-type local oscillator (flux-flow oscillator, FFO). The receiver is tested with a DSB noise temperature below 100 K around 500 GHz being pumped by its internal local oscillator (LO). The instantaneous bandwidth of 15-20% is estimated via FTS and heterodyne measurements that meet the requirements of most practical applications. The far field antenna beam is measured as ≈ f /10 with sidelobes below -16 dB that is suitable for coupling to a real telescope antenna. A nine-pixel imaging array receiver with each pixel containing an internally pumped receiver chip is developed and tested. A linewidth of the phase locked FFO as low as 1 Hz is measured relative to a reference oscillator in the frequency range 270-440 GHz. An rf amplifier on the base of a dc SQUID is developed and tested showing a noise figure below 10 K at 4 GHz and a bandwidth of about 300 MHz. This amplifier can be included as a part of an integrated receiver that is valuable for array applications.
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 FFO development and optimization is presented. In order to overcome temperature constraints and extend operation frequency of the fully Nb SIR we have developed and studied Nb-AlN-NbN circuits with a gap voltage Vg up to 3.7 mV and extremely low leak currents (Rj/Rn > 30). Continuous tuning of the frequency due to bending and overlapping of the Fiske steps and a possibility to phase lock the Nb-AlN-NbN FFO at any frequency in the range 350-750 GHz has been experimentally demonstrated. After optimization of the FFO design the free-running linewidth between 7 and 1.5 MHz has been measured in the frequency range 350 - 750 GHz, which allows to phase-lock from 50 to 95 % of the emitted FFO power. New designs of the FFO intended for further improvement of its parameters are under development, but even at the present state the Nb-AlN- NbN FFOs are mature enough for practical applications. These achievements enabled development of a 500 - 650 GHz integrated receiver for the Terahertz Limb Sounder (TELIS) project intended for atmosphere study and scheduled to fly on a balloon in 2008.
The concept of a fully integrated superconducting receiver looks very attractive for sub-mm space astronomy where low weight, power consumption and volume are required. The possibility to integrate on a few chips the different planar components: a SIS mixer, a superconducting local oscillator (LO), an intermediate frequency amplifier followed by superconducting circuits for digitizing and processing of down converted signals, is discussed. A first implementation of a real integrated quasioptical receiver for frequencies up to 500 GHz is described. The one-chip receiver comprises a double dipole antenna, parallel biased SIS array mixer and Josephson Flux Flow Oscillator (FFO) with matching circuits. The results of extensive investigations of the integrated receiver as well as design and investigation of novel superconducting elements are presented.>
A Superconducting Integrated Receiver (SIR) comprises on one chip all elements needed for heterodyne detection: a low-noise SIS mixer with quasioptical antenna, a Flux-Flow Oscillator (FFO) acting as a Local Oscillator (LO) and a second SIS harmonic mixer (HM) for the FFO phase locking. Light weight and low power consumption combined with nearly quantum limited sensitivity and a wide tuning range of the FFO make SIR a perfect candidate for many practical applications. In particular, the SIR developed for novel balloon borne instrument TELIS (TErahertz and submillimeter LImb Sounder) covers frequency range 480 - 650 GHz. As a result of recent receiver's optimization the DSB noise temperature was measured as low as 120 K for the SIR with intermediate frequency (IF) band 4 - 8 GHz. The capability of the SIR for high resolution atmospheric spectroscopy has been successfully proven with scientific balloon flights from Kiruna, North Sweden. Diurnal cycles of ClO and BrO has been observed with BrO line level of only about 0.5 K. Possibility to use the SIRs for analysis of the breathed out air at medical survey has been demonstrated.