An integrated 500 GHz receiver with superconducting local oscillator

Koshelets, V. P.; Shitov, S. V.; Filippenko, L. V.; Baryshev, A.; Luinge, W.; Golstein, H.; Stadt, H. van de; Gao, J. R.; Graauw, Th. de

doi:10.1109/77.622178

Cited by 26 publications

(15 citation statements)

References 9 publications

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“…Both the SIS and FFO junctions are fabricated from the same Nb-AlO x -Nb trilayer; details have been described elsewhere. 2,4,6,7 Additional test FFO's together with the integrated circuits necessary for the FFO linewidth measurement are also placed on the same silicon substrate. The experiments are performed with the samples located inside a cryoperm can and two external -metal shields.…”

Section: Methodsmentioning

confidence: 99%

“…Josephson flux-flow oscillators ͑FFO's͒ based on the unidirectional and viscous flow of magnetic flux quanta in a long Josephson tunnel junction ͑LJJ͒ with relatively high damping 1 have been successfully employed [2][3][4] in fully superconducting-integrated submillimeter-wave receivers. Recently Nb-AlO x -Nb FFO's have been successfully tested above the gap frequency of Nb ͑up to 850 GHz͒ and power levels sufficient to pump a SIS mixer have been demonstrated ͑about 5 W at 440 GHz͒.…”

Section: Introductionmentioning

confidence: 99%

“…Recently Nb-AlO x -Nb FFO's have been successfully tested above the gap frequency of Nb ͑up to 850 GHz͒ and power levels sufficient to pump a SIS mixer have been demonstrated ͑about 5 W at 440 GHz͒. Measurements at 500 GHz have given receiver noise temperatures ͓DSB ͑double side band͔͒ as low as 140 K, 4 which is only a few times the fundamental quantum value h f /k B ͑h is Planck's constant, and k B is Boltzmann's constant͒. For spectral radio astronomy applications, besides the low-noise temperature, also a high-frequency resolution of the receiver is very important.…”

Section: Introductionmentioning

confidence: 99%

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Self-pumping effects and radiation linewidth of Josephson flux-flow oscillators

et al. 1997

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Flux-flow oscillators ͑FFO's͒ are being developed for integration with a SIS mixer for use in submillimeter wave receivers. The present work contains a detailed experimental study of the dc, microwave, and noise properties of Nb-AlO x -Nb FFO's. A model based on the Josephson self-pumping effect is proposed for an explanation of the experimental current-voltage characteristics. A reliable technique based on harmonic mixing is used to determine the spectral linewidth of the radiation emitted by the integrated FFO's up to 600 GHz. Comprehensive measurements of the dependence of the linewidth on the dynamic resistance and the applied magnetic field have been performed. In the resonant regime a linewidth as small as 200 kHz is obtained at 450 GHz. The experimental data are compared with recent theoretical predictions. ͓S0163-1829͑97͒02233-9͔

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-pumping effects and radiation linewidth of Josephson flux-flow oscillators

et al. 1997

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“…2 A DSB noise temperature below 100 K has been achieved for an integrated receiver with the FFO operating near 500 GHz. 3 The antenna beam, approximately f /10 with sidelobes below Ϫ17 dB, 3 makes the integrated receiver suitable for coupling to the real telescope.…”

Section: Introductionmentioning

confidence: 99%

Phase locked 270–440 GHz local oscillator based on flux flow in long Josephson tunnel junctions

Koshelets

Shitov

Filippenko

et al. 2000

Review of Scientific Instruments

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The combination of narrow linewidth and wide band tunability makes the Josephson flux flow oscillator ͑FFO͒ a perfect on-chip local oscillator for integrated sub-mm wave receivers for, e.g., spectral radio astronomy. The feasibility of phase locking the FFO to an external reference oscillator is demonstrated experimentally. A FFO linewidth as low as 1 Hz ͑determined by the resolution bandwidth of the spectrum analyzer͒ has been measured in the frequency range 270-440 GHz relative to a reference oscillator. This linewidth is far below the fundamental level given by shot and thermal noise of the free-running tunnel junction. The results of residual FFO phase noise measurements are also presented. Finally, we propose a single-chip fully superconductive receiver with two superconductor-insulator-superconductor mixers and an integrated phase-locked loop.

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“…To accommodate multiple fluxons and achieve a flux-flow regime, the length of the Josephson junction used as a FFO exceeds the Josephson penetration length by a large factor. The potential of FFO for practical applications has been justified by development of a superconducting integrated receiver (SIR) [65,66] which was successfully used in remote heterodyne spectroscopy of the Earth atmosphere on board of a high-altitude balloon [67,68], as well as first spectral measurements of THz radiation emitted from intrinsic Josephson junction stacks (BSCCO mesa) at frequencies up to 750 GHz [69,70].…”

Section: Model Of Josephson Flux-flow Oscillatormentioning

confidence: 99%

Josephson flux-flow oscillator: The microscopic tunneling approach

2017

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Citation: GULEVICH, D.R., KOSHELETS, V.P. and KUSMARTSEV, F.V., 2017.Josephson flux-flow oscillator:The microscopic tunneling approach.Physical Review B, 96 (2), 024515-1 -024515-12.Additional Information:• We elaborate a theoretical description of large Josephson junctions which is based on Werthamer's microscopic tunneling theory. The model naturally incorporates coupling of electromagnetic radiation to the tunnel currents and, therefore, is particularly suitable for description of the self-coupling effect in Josephson junction. In our numerical calculations we treat the arising integro-differential equation, which describes temporal evolution of the superconducting phase difference coupled to the electromagnetic field, by the Odintsov-Semenov-Zorin algorithm. This allows us to avoid evaluation of the time integrals at each time step while taking into account all the memory effects. To validate the obtained microscopic model of large Josephson junction we focus our attention on the Josephson flux-flow oscillator. The proposed microscopic model of flux-flow oscillator does not involve the phenomenological damping parameter, rather the damping is taken into account naturally in the tunnel current amplitudes calculated at a given temperature. The theoretically calculated current-voltage characteristics is compared to our experimental results obtained for a set of fabricated flux-flow oscillators of different lengths.

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An integrated 500 GHz receiver with superconducting local oscillator

Cited by 26 publications

References 9 publications

Self-pumping effects and radiation linewidth of Josephson flux-flow oscillators

Self-pumping effects and radiation linewidth of Josephson flux-flow oscillators

Phase locked 270–440 GHz local oscillator based on flux flow in long Josephson tunnel junctions

Josephson flux-flow oscillator: The microscopic tunneling approach

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