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The 700–950 GHz Superconducting Receiving Structures for Radio Astronomy

Rudakov, K. I. ; Koshelets, V. P. ; Baryshev, A. M. ; Dmitriev, P. N. ; Khudchenko, A. V.

Radiophysics and quantum electronics, 2017, Vol.59 (8-9), p.711-714 [Periódico revisado por pares]

New York: Springer US

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Título:
The 700–950 GHz Superconducting Receiving Structures for Radio Astronomy
Autor: Rudakov, K. I. ; Koshelets, V. P. ; Baryshev, A. M. ; Dmitriev, P. N. ; Khudchenko, A. V.
Assuntos: Aluminum ; Astronomy ; Astrophysics and Astroparticles ; Current density ; Electrodes ; Frequency ranges ; Hadrons ; Heavy Ions ; Lasers ; Mathematical and Computational Physics ; Noise temperature ; Nuclear Physics ; Observations and Techniques ; Optical Devices ; Optics ; Photonics ; Physics ; Physics and Astronomy ; Quantum Optics ; Receivers ; Receiving ; Superconductors ; Telecommunications equipment ; Theoretical ; Tunnel junctions ; Waveguides
É parte de: Radiophysics and quantum electronics, 2017, Vol.59 (8-9), p.711-714
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: We have designed, fabricated, and tested the waveguide receiving element, which is based on the tunnel superconductor–insulator–superconductor structures, for the frequency range 790–950 GHz. Two Nb/AlN/NbN tunnel junctions are incorporated in a microstrip line consisting of the bottom NbTiN-film electrode with a thickness of about 300 nm and the top 500 nm-thick aluminum electrode. The production-process optimization allows one to ensure the following characteristics of these junctions: submicron area (0.5 μm 2 for each junction), current density about 30 kA/cm 2 , and band gap width 3.2 mV. Such tunnel junctions ensure the receiver operation in a wide frequency range (700–950 GHz), which was confirmed by the Fourier transform spectroscopy and the noise-temperature measurements. At a frequency of 725 Hz, the corrected noise temperature of the receiver amounts to 120 K, which is only threefold greater than the quantum limit hf/k B , where h is the Planck’s constant, f is the frequency, and k B is Boltzmann’s constant. In the upper part of this frequency range, the noise temperature increases up to 390 K.
Editor: New York: Springer US
Idioma: Inglês

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The 700–950 GHz Superconducting Receiving Structures for Radio Astronomy

Rudakov, K. I. ; Koshelets, V. P. ; Baryshev, A. M. ; Dmitriev, P. N. ; Khudchenko, A. V.

New York: Springer US

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