Signal and Noise Characteristics of Terahertz Frequency-Selective and Broadband High-$T_{c}$ Josephson Detectors

Lyatti, M.; Divin, Y.Y.; Volkov, O. Yu.; Павловский, В.; Gubankov, V. N.; Urban, K.

doi:10.1109/tasc.2007.898188

Cited by 21 publications

(9 citation statements)

References 9 publications

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“…The power level is set there by losses, mismatch, and power absorption by the samples under study. Moreover, in applied problems one has to deal with low power levels and a linear response of detector [ 48 ]. Specifically in this area of the device operation, the effect described in the paper can be observed.…”

Section: Discussionmentioning

confidence: 99%

Nonmonotonous temperature dependence of Shapiro steps in YBCO grain boundary junctions

Revin¹,

Masterov²,

Парафин³

et al. 2021

Beilstein J. Nanotechnol.

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The amplitudes of the first Shapiro steps for an external signal with frequencies of 72 and 265 GHz are measured as function of the temperature from 20 to 80 K for a 6 μm Josephson grain boundary junction fabricated by YBaCuO film deposition on an yttria-stabilized zirconia bicrystal substrate. Non-monotonic dependences of step heights for different external signal frequencies were found in the limit of a weak driving signal, with the maxima occurring at different points as function of the temperature. The step heights are in agreement with the calculations based on the resistively–capacitively shunted junction model and Bessel theory. The emergence of the receiving optima is explained by the mutual influence of the varying critical current and the characteristic frequency.

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Section: Discussionmentioning

confidence: 99%

Nonmonotonous temperature dependence of Shapiro steps in YBCO grain boundary junctions

Revin¹,

Masterov²,

Парафин³

et al. 2021

Beilstein J. Nanotechnol.

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show abstract

“…Although there is always a parameter spread in fabrication, for high temperatures of the order of 70 K this difference is insignificant [ 3 ]. Thus, the parameters of the junctions were chosen as typical for bicrystal JJs fabricated by magnetron deposition [ 24 – 25 31 – 33 ]: I c = 100 μA, R N = 5 Ω, C = 0.02 pF. The antenna parameters were chosen based on the impedance calculation using the relations Re( Z ) = R L , dIm( Z )/dω = 2 L L , and .…”

Section: Numerical Modelingmentioning

confidence: 99%

“…The inset of Figure 6a shows the Δ V ( P MW ) dependence at the optimal bias I = 98 μA. The response amplitude is a linear function of the radiation power at low values of P MW and saturates for P MW = 10 −7 W [ 17 , 33 – 34 ]. The responsivity r V , which is a derivative of the Δ V ( P MW ) dependence, will be discussed later.…”

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.

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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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“…3 dB, NEP is the noise equivalent power and B is the bandwidth of the electronics of the detector. The dynamic range D of the frequency selective Josephson detector is described by the following equation [8] …”

Section: Noise Equivalent Power (Nep) and Dynamic Rangementioning

confidence: 99%

New approach to ECE measurements based on Hilbert-transform spectral analysis

Pandya

Divin

2015

EPJ Web of Conferences

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Abstract. Spectroscopy of Electron Cyclotron Emission (ECE) has been established asadequate diagnostic technique for fusion research machines. Among various instruments for ECE diagnostics, only Fourier-transform spectrometers with Martin-Puplett interferometers can measure electron cyclotron radiation in a broadband frequency range from 70 to 1000 GHz. Before these measurements, a complete system including a frontend radiation collector, a transmission line, an interferometer and a radiation detector should be absolutely calibrated. A hot/cold calibration source and data-averaging technique are used to calibrate the total ECE diagnostic system. It takes long time to calibrate the ECE system because of the low power level of the calibration source and high values of the noise equivalent power (NEP) of the detection system. A new technique, Hilbert-transform spectral analysis, is proposed for the ITER plasma ECE spectral measurements. An operation principle, characteristics and advantages of the corresponding Hilbert-transform spectrum analyser (HTSA) based on a high-T c Josephson detector are discussed. Due to lower NEP-values of the Josephson detector, this spectrum analyser might demonstrate shorter calibration times than that for the Martin-Puplett interferometer.

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Signal and Noise Characteristics of Terahertz Frequency-Selective and Broadband High-$T_{c}$ Josephson Detectors

Cited by 21 publications

References 9 publications

Nonmonotonous temperature dependence of Shapiro steps in YBCO grain boundary junctions

Nonmonotonous temperature dependence of Shapiro steps in YBCO grain boundary junctions

A broadband detector based on series YBCO grain boundary Josephson junctions

New approach to ECE measurements based on Hilbert-transform spectral analysis

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