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Photonics 2019, 6(1), 7; https://doi.org/10.3390/photonics6010007

THz Mixing with High-TC Hot Electron Bolometers: A Performance Modeling Assessment for Y-Ba-Cu-O Devices

1
CentraleSupélec, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Sorbonne Université, Group of Electrical Engineering, GeePs, 91190 Gif sur Yvette, France
2
Institute for High Frequency and Communication Technology, University of Wuppertal, D-42119 Wuppertal, Germany
*
Author to whom correspondence should be addressed.
Received: 15 December 2018 / Revised: 17 January 2019 / Accepted: 24 January 2019 / Published: 25 January 2019
(This article belongs to the Special Issue Terahertz Photonics)
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Abstract

Hot electron bolometers (HEB) made from high-TC superconducting YBa2Cu3O7x (YBCO) oxide nano-constrictions are promising THz mixers, due to their expected wide bandwidth, large mixing gain, and low intrinsic noise. The challenge for YBCO resides, however, in the chemical reactivity of the material and the related aging effects. In this paper, we model and simulate the frequency dependent performance of YBCO HEBs operating as THz mixers. We recall first the main hypotheses of our hot spot model taking into account both the RF frequency effects in the YBCO superconducting transition and the nano-constriction impedance at THz frequencies. The predicted performance up to 4 THz is given in terms of double sideband noise temperature TDSB and conversion gain G. At 2.5 THz for instance, TDSB ≅ 1000 K and G ≅ − 6 dB could be achieved at 12.5 μW local oscillator power. We then consider a standoff target detection scheme and examine the feasibility with YBCO devices. For instance, detection at 3 m through cotton cloth in passive imaging mode could be readily achieved in moderate humidity conditions with 10 K resolution. View Full-Text
Keywords: THz heterodyne mixer; hot electron bolometer; Y-Ba-Cu-O high-TC superconductor; hot spot model; RF local power distribution; THz impedance; noise temperature; conversion loss; standoff detection prediction; passive imaging THz heterodyne mixer; hot electron bolometer; Y-Ba-Cu-O high-TC superconductor; hot spot model; RF local power distribution; THz impedance; noise temperature; conversion loss; standoff detection prediction; passive imaging
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ladret, R.; Dégardin, A.; Jagtap, V.; Kreisler, A. THz Mixing with High-TC Hot Electron Bolometers: A Performance Modeling Assessment for Y-Ba-Cu-O Devices. Photonics 2019, 6, 7.

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