A three photon noise SIS heterodyne receiver at submillimeter wavelength

Karpov, A.; Blondel, J.; Voß, M.; Gundlach, K. H.

doi:10.1109/77.784014

Cited by 23 publications

(8 citation statements)

References 10 publications

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“…(This "source impedance" has been calculated in a three-dimensional (3-D) electromagnetic field simulator. 4 ) From this plot, it is seen that the original 1-THz waveguide design is characterized by a source impedance with a strong frequency dependence and a large imaginary component. In comparison, the source impedances of the 0.65-and 0.88-THz half-height waveguide designs are much less frequency dependent (although they retain significant reactive components).…”

Section: Mixer and Sis Device Designmentioning

confidence: 99%

“…The critical waveguide and device substrate dimensions in this design are summarized in Table I. Three-dimensional electromagnetic simulations of the embedding impedance offered by the waveguide geometries are calculated 4 Ansoft Corporation, Pittsburgh, PA. Effective source impedance at the input to the on-chip microstrip tuning circuit (at the center of the "across-the-waveguide" bowtie probe, given the fixed-depth waveguide backshort, the fused quartz substrate in the substrate channel, and the RF choke filter patterned on the substrate surface).…”

Section: Mixer and Sis Device Designmentioning

confidence: 99%

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Low-noise 0.8-0.96- and 0.96-1.12-THz superconductor-insulator-superconductor mixers for the herschel space observatory

Jackson

Lange

Zijlstra

et al. 2006

IEEE Trans. Microwave Theory Techn.

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Section: Mixer and Sis Device Designmentioning

confidence: 99%

Section: Mixer and Sis Device Designmentioning

confidence: 99%

Low-noise 0.8-0.96- and 0.96-1.12-THz superconductor-insulator-superconductor mixers for the herschel space observatory

Jackson

Lange

Zijlstra

et al. 2006

IEEE Trans. Microwave Theory Techn.

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“…SIS mixers consisting of Nb/Al-AlOx/Nb tunnel junctions and microstrips have performed extremely well with a few times of quantum-limited noise at frequencies less than 725 GHz, which is the gap frequency of Nb [1]. The ALMA specifications in most of the bands will be accomplished using conventional all Nb-based SIS mixers.…”

Section: Introductionmentioning

confidence: 97%

SIS Mixers Based on NbN Techniques for ALMA Band 10

Takeda

Uzawa²,

Wang³

2007

IEEE Trans. Appl. Supercond.

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We designed, fabricated, and tested SIS mixers based on NbN techniques and estimated the specific capacitance of NbN/AlN/NbN tunnel junctions, which were fabricated by DC-magnetron sputtering, by measuring DC-SQUID resonance steps. In the mixers, NbN/AlN/NbN junctions and NbN SiO 2 Al tuning circuits were used for investigating receiver performance at frequencies greater than 900 GHz. The specific capacitance of the junction was estimated at 120 fF m 2 with a critical current density of 12 kA cm 2 . The resonance frequencies generated in the tuning circuits linearly changed with respect to the tuning lengths up to at least 1.1 THz. We found that an input-circuit structure, which we used, is a factor that degrades receiver noise at frequencies greater than 900 GHz.Index Terms-Fourier transform spectrometer, niobium nitride, SIS mixers, submillimeter wave.

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“…The minimum submm SIS receiver noise is only three times above the quantum limit 2 . This type of ultra low noise receiver is needed to cover the upper part of the atmosphere transparency band accessible to ground-based radio astronomy facilities.…”

Section: Introductionmentioning

confidence: 99%

Low-noise SIS mixer for far-infrared radio astronomy

Karpov

Miller

Rice

et al. 2004

Millimeter and Submillimeter Detectors for Astronomy II

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We present a low noise SIS mixer developed for the 1.2 THz band of the heterodyne spectrometer of the Herschel Space Observatory. The device of this design will be among the first SIS mixers flown in space at Herschel. The developed SIS mixer has a quasi-optical design, with a double slot planar antenna and an extended spherical lens made of pure Si. The SIS junctions are Nb/AlN/NbTiN with the critical current density of about 30 KA/cm2 and with the junction area of a quarter of a micron square. For the ease of the Josephson current suppression, the SIS junctions are diamond-like shaped. The simultaneous suppression of the Josephson currents in the two SIS junctions is a particular advantage of the used shape. A low loss Nb/Au micro-strip transmission line is used for the first time in the mixer circuit well above the gap frequency of Nb.Using the new mixer we demonstrated the minimum uncorrected Double Sideband receiver noise of 550 K (Y=1.34). The minimum receiver noise corrected for the local oscillator beam splitter and for the cryostat window is 330 K, about 6 hν/k, apparently for the first time in the THz frequencies range.

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A three photon noise SIS heterodyne receiver at submillimeter wavelength

Cited by 23 publications

References 10 publications

Low-noise 0.8-0.96- and 0.96-1.12-THz superconductor-insulator-superconductor mixers for the herschel space observatory

Low-noise 0.8-0.96- and 0.96-1.12-THz superconductor-insulator-superconductor mixers for the herschel space observatory

SIS Mixers Based on NbN Techniques for ALMA Band 10

Low-noise SIS mixer for far-infrared radio astronomy

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