Millimeter-wave Hilbert-transform spectroscopy with high-<i>T</i>
                  <i>c</i> Josephson junctions

Divin, Y.Y.; Schulz, H.; Poppe, U.; Klein, N.; Urban, K.; Павловский, В.

doi:10.1063/1.115699

Cited by 39 publications

(13 citation statements)

References 2 publications

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“…The corresponding detectors based on low-T c Josephson junctions have been studied earlier, [2][3][4][5] and only recently, after some progress in junction fabrication, the first evaluations of high-T c Josephson junctions for this application have been carried out. [6][7][8][9] One of the main unanswered questions in this field is the spectral range where the frequency-selective Josephson detection can take place. Here, we report on the results of our study of this problem.…”

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confidence: 99%

Frequency-selective incoherent detection of terahertz radiation by high-Tc Josephson junctions

Divin

Poppe

Volkov

et al. 2000

Applied Physics Letters

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The detector response of YBa2Cu3O7−x Josephson grain-boundary junctions to monochromatic radiation with the frequency f in the range from 60 GHz to 4 THz has been studied. Frequency-selective odd-symmetric resonances in the responses ΔI(V) of these junctions to radiation with different frequencies f have been observed near the voltages V=hf/2e in almost a decade of spectral range for any operating temperature in the range from 30 to 85 K. The spectral range of the selective detection has scaled with the IcRn product of the Josephson junction, reaching the range of 0.16–3.1 THz for a IcRn product of 1.5 mV. A resolving power δf/f of around 10−3 has been demonstrated in the selective detection by Josephson junctions. The high-frequency falldown of the amplitude of the selective response has been found to be proportional to exp[−P/P0], where P=(hf/2e)2/Rn is the power dissipated in the junction at the resonance and P0 is a characteristic power level. The values of P0 for our junctions were around 20 μW at 34 K and 2 μW at 78 K.

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confidence: 99%

Frequency-selective incoherent detection of terahertz radiation by high-Tc Josephson junctions

Divin

Poppe

Volkov

et al. 2000

Applied Physics Letters

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“…The first Shapiro step at V≈±1.17 mV, corresponds to the frequency-selective response. The incident spectrum can be numerically reconstructed by Hilbert transformation of the difference ΔI (hf/2e) between measured I-V curves with and without the radiation [28]. The derived Hilbert spectrum is plotted and it shows a peak at 570 GHz.…”

Section: Detector Development and Characterisationmentioning

confidence: 99%

Terahertz and Millimetre Wave Imaging with a Broadband Josephson Detector Working above 77 K

Hellicar

Hanham

et al. 2010

J Infrared Milli Terahz Waves

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A high-T c superconducting (HTS) broadband Josephson detector has been developed and applied to millimetre wave (mm-wave) and terahertz (THz) imaging. The detector is based on a YBa 2 Cu 3 O 7-x (YBCO) step-edge Josephson junction, which is coupled to a thin-film log-periodic antenna, designed for operation at 200-600 GHz, and a hemispheric silicon lens. The junction parameters have been optimised to achieve a high I c R n value so that the detector responds well to the specified frequencies at liquid nitrogen temperature (77 K). Images at ∼200 GHz and ∼600 GHz were acquired with the same detector; each demonstrated their unique properties. The results demonstrate the potential of achieving a cheaper, compact and portable multi-spectral imager based on a HTS detector.

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“…Actually, the development of the Hilbert-transform spectral analysis was stimulated by a need to measure the instrumental function of the far-infrared grating spectrometer and actually the measurement of this instrumental function was the first terahertz application of the Hilbert-transform technique [14]. Later, a Lorentz form of the instrumental function of the Hilbert-transform spectrum analyzer was several times experimentally established [15]- [17]. After experimental evidences, the instrumental function was also theoretically considered and the Lorentz form was deduced [11].…”

Section: Instrumental Functionmentioning

confidence: 99%

Terahertz Applications of Hilbert-Transform Spectral Analysis

Divin

Snezhko

Lyatti

et al. 2014

IEEE Trans. Appl. Supercond.

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Bridging of the terahertz gap in the electromagnetic spectrum between the microwave and infrared ranges requires a variety of new technological developments from basic elements, such as emitters and detectors, to complete systems, such as spectrum analyzers and imagers. As an example of these developments, Hilbert-transform spectral analysis of terahertz radiation sources has been demonstrated. A spectrum analyzer based on a high-T c square-law Josephson detector has been developed and characterized in the frequency range from 50 to 1800 GHz. Spectra of output terahertz radiation from optically-pumped lasers and frequency multipliers have been studied, and their regimes were optimized for a single-frequency operation. Starting from the optimized multipliers, a polychromatic source has been synthesized and characterized with Hilbert-transform spectrum analyzer.

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Millimeter-wave Hilbert-transform spectroscopy with high-T c Josephson junctions

Cited by 39 publications

References 2 publications

Frequency-selective incoherent detection of terahertz radiation by high-Tc Josephson junctions

Frequency-selective incoherent detection of terahertz radiation by high-Tc Josephson junctions

Terahertz and Millimetre Wave Imaging with a Broadband Josephson Detector Working above 77 K

Terahertz Applications of Hilbert-Transform Spectral Analysis

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