Fine Structure of Radiation Spectra from Large Josephson Systems
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2022-03-24 14:48
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GALIN, Mikhail, KIELER, Oliver, LEVICHEV, M., EL'KINA, A., KURIN, V.. Fine Structure of Radiation Spectra from Large Josephson Systems. In: The 12th international conference on intrinsic Josephson effect and horizons of superconducting spintronics, 22-25 octombrie 2021, Chişinău. Chişinău: 2021, p. 32. ISBN 978-9975-47-215-9.
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The 12th international conference on intrinsic Josephson effect and horizons of superconducting spintronics 2021
Conferința "The 12th international conference on intrinsic Josephson effect and horizons of superconducting spintronics"
Chişinău, Moldova, 22-25 octombrie 2021

Fine Structure of Radiation Spectra from Large Josephson Systems


Pag. 32-32

Galin Mikhail12, Kieler Oliver3, Levichev M.3, El'kina A.1, Kurin V.1
 
1 Institute for Physics of Microstructures RAS,
2 Moscow Institute of Physics and Technology,
3 Physikalisch-Technische Bundesanstalt (PTB), Fachbereich Kryosensorik
 
Disponibil în IBN: 16 martie 2022


Rezumat

At present, many scientific groups are investigating superconducting systems containing Josephson junctions (JJs) as generators of subterahertz and terahertz radiation [1–4]. For the arrays with a large number of JJs the question of their coherent contribution to output radiation becomes the key point for practical applications. The synchronization is usually provided mainly by resonant modes which can be excited in cavities of very different types [4–6]. In this work we demonstrate that some peculiarities in external electrodynamical environment can affect the synchronization regimes in large JJ arrays that manifests in fine structure of spectral properties of their radiation. We investigate transport (IVC) and radiation (spectrum, emission power) characteristics of the arrays containing up to 10 thousands Nb/NbSi/Nb junctions composed in different designs. Measurements were performed in liquid helium dewar at 4.2 K. Current steps in IVCs were associated with some internal resonances excited in parts of the arrays. Data of spectral measurements of the array with 9996 JJs are considered to indicate the effects of two-frequency Josephson emission and non-Josephson generation. The radiation power from this array detected by the room receivers reaches 14 μW at 255 GHz. However these data, also as the spectrum data and IVC, are very sensitive to manipulation with the measurement probe that we explained by the influence of external electrodynamical elements inside the probe to the array. All of these conclusions are confirmed by the results of numerical simulations of Josephson antennas combined the solutions of the Maxwell equations and of nonlinear equations for the JJs [7]. In more advanced current version of our software the parameter scattering of JJs has been introduced in the algorithm.