Bandwidth and Noise of Submillimeter Wave Cuprate Bicrystal Josephson Junction Detectors

Ovsyannikov, G. A.; Borisenko, I. V.; Constantinian, K. Y.; Kislinski, Y.V.; Hakhoumian, A.A.; Pogosyan, N.G.; Zakaryan, T.V.; Pedersen, Niels Falsig; Mygind, J.; Uzunoglu, N.K.; Karagianni, Evangelia A.

doi:10.1109/tasc.2005.849902

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…Its value ( Figure 7d ) for a single JJ of about is in agreement with the experimental values [ 17 , 34 , 43 – 44 ]. For a configuration of three JJs in series, the responsivity increased by 1.8 times compared to a single junction, and the noise increased by 1.2 times.…”

Section: Numerical Modelingsupporting

confidence: 88%

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A broadband detector based on series YBCO grain boundary Josephson junctions

Glushkov¹,

Chiginev²,

Kuzmin³

et al. 2022

Beilstein J. Nanotechnol.

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Modeling of a broadband receiving system based on a meander series of Josephson YBaCuO grain boundary junctions integrated into a log-periodic antenna was carried out. The electromagnetic properties of the system, namely amplitude–frequency characteristic, beam pattern, and fraction of the absorbed power in each Josephson junction were investigated. Based on the obtained results, a numerical simulation of one-dimensional arrays was carried out. The dc characteristics of the detector were calculated, that is, current–voltage characteristic, responsivity, noise, and noise-equivalent power (NEP) for a 250 GHz external signal. The optimal number of junctions to obtain the minimum NEP was found. The use of a series of junctions allows one to increase the responsivity by a factor of 2.5, the NEP value by a factor of 1.5, and the power dynamic range by a factor of 5. For typical YBaCuO Josephson junctions fabricated on a ZrYO bicrystal substrate by magnetron deposition, the following parameters were obtained at a temperature of 77 K: responsivity = 9 kV/W; NEP = 3·10−13 W/Hz(1/2); power dynamic range = 1·106.

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Section: Numerical Modelingsupporting

confidence: 88%

“…Figure 7b shows the dependence of r V = d V /d P MW on the power for the optimal operating current. For a single junction (bottom blue curve) r V reaches the typical 4000 V/W [ 34 , 43 – 44 ]. The voltage responsivity can be approximately expressed as [ 43 ]…”

Section: Numerical Modelingmentioning

confidence: 99%

A broadband detector based on series YBCO grain boundary Josephson junctions

Glushkov¹,

Chiginev²,

Kuzmin³

et al. 2022

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…HTS devices, on the other hand, offer not only the obvious practical advantage of operating at temperatures above 77 K, but also a very high band-gap voltage which extends their response well into the THz range. Several groups have explored the response of HTS bicrystal Josephson junctions [11][12][13], and frequencies up to ∼ 4.25 THz have been detected [13]. In spite of this progress, however, imaging at THz frequencies with HTS Josephson junction detectors has not been convincingly reported.…”

Section: Introductionmentioning

confidence: 99%

Terahertz imaging at 77 K

Du¹,

Hellicar²,

Li³

et al. 2009

Supercond. Sci. Technol.

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Terahertz (THz) technology is receiving increasing attention around the world due to its important potential in many application areas. Novel compact solid-state sources and detectors are being sought for THz radiation and detection. We report the realization of a THz imager based on a high- Tc superconducting (HTS) Josephson detector working above liquid nitrogen temperature (77 K). The detector, made of a YBa2Cu3O7−x (YBCO) step-edge Josephson junction, is coupled to a thin-film ring-slot antenna and a hemispheric silicon lens. Images of high visual quality are obtained which demonstrate unique properties of THz radiation such as the sensitivity to water content and the ability to penetrate packaging materials. The results should stimulate further research leading to the development of a HTS superconducting THz imaging system.

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“…In reported traditional antennas, slot antennas [12][13][14][15] were the main choices to match the impedance of JJ, such as double-slot antenna [16] and ring-slot antenna [17,18]. However, these kinds of antennas have to be fed by coplanar waveguide (CPW), meaning the shape of the ground has to be changed during the impedance matching.…”

Section: Introductionmentioning

confidence: 99%

High-Tc Superconducting Josephson Junction Harmonic Mixers with Stub Tuners on Integrated Bowtie Antennas

Chun

Gao

et al. 2022

Applied Sciences

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Ordinary mixers can hardly meet the requirements in terahertz (THz) communications due to the low-power and expensive THz sources. Sensitive harmonic mixers have been widely studied to avoid this problem, owing to the fact that the higher the number of harmonics, the lower the local oscillator (LO) frequency, and the lower the cost. High-Tc superconducting (HTS) Josephson junction (JJ) mixers are performing candidates for THz receiver frontends because of the advantages of excellent sensitivity, wide bandwidth, high harmonic number and low LO power requirement. However, the normal-state resistance of HTS JJ is so low that traditional antennas are difficult to match it. In other words, it is quite a challenge to match the input impedance to a low input impedance for traditional antennas, especially for antennas fed by coplanar striplines (CPSs). In this work, based on the structure of bowtie, two types of stub tuners were integrated to decrease the impedance of the bowtie antenna so as to improve the coupling efficiency between the traditional bowtie antenna and the JJ. Furthermore, HTS YBa2Cu3O7-δ (YBCO) JJ harmonic mixers coupled with the proposed structures and fed by CPSs are fabricated and measured. The measurements show that the JJ mixer coupled with a pair of open-end stubs of the bowtie antenna achieves up to 88 harmonics, with a conversion efficiency of −69.6 dB. In contrast, the JJ mixer coupled with a pair of lumped-element stubs of the bowtie antenna only attains to 30 harmonics, with a conversion efficiency of −73.4 dB. Additional numerical simulations indicate that the coupling efficiency is enhanced when the complex impedance of the antenna is explicitly considered. Compared with other coupled traditional antennas, the JJ mixer with bowtie antenna has the largest harmonic number. This work paves the way for the future application of low-frequency and low-cost LO for THz communications.

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Bandwidth and Noise of Submillimeter Wave Cuprate Bicrystal Josephson Junction Detectors

Cited by 8 publications

References 8 publications

A broadband detector based on series YBCO grain boundary Josephson junctions

A broadband detector based on series YBCO grain boundary Josephson junctions

Terahertz imaging at 77 K

High-Tc Superconducting Josephson Junction Harmonic Mixers with Stub Tuners on Integrated Bowtie Antennas

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