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with High T, Josephson Junctions illimeter- and Submillimeter-Wave Radiation

Yu. Ya. Divin, Valery V. Pavlovshi, O. Yu. Volkov, Russian Federation, H. Schulz, U. Poppe, N. Klein, Knut W. Urban

Published Jan 1, 1997• 0 citations
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Abstract

We have demonstrated the first applications of Josephson-effect-based Hilbert-transform spectral analysis using high-Tc Josephson junctions. YBa~Cu307-~ grain- boundary Josephson junctions have been fabricated on (110) NdGa03 bicrystal substrates for these measurements. At first, spectra of Josephson radiation have been measured by Hilbert- transform technique in the range 60 - 800 GI%. A Lorentzian shape oft Josephson radiation and possibility to obtain a spectral resolution as low as 0.1 cm-1 in the submillimeter- wave range has been demonstrated at liquid nitrogen temperature. At second, spectra of high-harmonic content of the radiation coming from commercial millimeter-wave oscillators have been measured by Hilbert-transform technique in the spectral range from 60 to 450 GHz. The comparison of Hilbert-transform spectral analysis with conventional techniques is given.

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We have demonstrated the first applications of Josephson-effect-based Hilbert-transform spectral analysis using high-Tc Josephson junctions. YBaCu307- grain- boundary Josephson junctions have been fabricated on (110) NdGa03 bicrystal substrates for these measurements. At first, spectra of Josephson radiation have been measured by Hilbert- transform technique in the range 60 - 800 GI%. A Lorentzian shape oft Josephson radiation and possibility to obtain a spectral resolution as low as 0.1 cm-1 in the submillimeter- wave range has been demonstrated at liquid nitrogen temperature. At second, spectra of high-harmonic content of the radiation coming from commercial millimeter-wave oscillators have been measured by Hilbert-transform technique in the spectral range from 60 to 450 GHz. The comparison of Hilbert-transform spectral analysis with conventional techniques is given.
We have demonstrated the first applications of Josephson-effect-based Hilbert-transform spectral analysis using high-T/sub c/ Josephson junctions. YBa/sub 2/Cu/sub 3/O/sub 7-x/ grain-boundary Josephson junctions have been fabricated on [110] NdGaO/sub 3/ bicrystal substrates for these measurements. At first, spectra of Josephson radiation have been measured by the Hilbert-transform technique in the range 60-800 GHz. A Lorentzian shape of the Josephson radiation and the possibility to obtain a spectral resolution as low as 0.1 cm/sup -1/ in the submillimeter-wave range has been demonstrated at liquid nitrogen temperature. Moreover, spectra of high-harmonic content of the radiation coming from commercial millimeter-wave oscillators have been measured in the spectral range from 60 to 450 GHz. A comparison of Hilbert-transform spectral analysis with conventional techniques is given.
The IV curves and the direct detector response of HTS bicrystal grain-boundary Josephson junctions have been measured under submm-wave irradiation at frequencies 350-750 GHz. The Josephson oscillation spectrum has been measured using the Hilbert transformation of detection response dependence. The Josephson oscillation linewidth and corresponding value of effective noise is compared to the estimates from the dc measurements of noise rounding of IV curve. To separate sources of noise the direct measurements of junction's output noise has been performed at 1.5 GHz and low frequencies 0.5-20 kHz.
The AC Josephson effect in YBa/sub 2/Cu/sub 3/O/sub 7-x/ grain-boundary junctions (GBJs) was studied in the temperature range from 4 K to 90 K. The temperature dependence of the linewidth of millimeter-wave Josephson oscillations was measured, and it is shown that the derived effective noise temperature of GBJ might be as low as the physical temperature in the temperature range investigated. This makes it possible to use the resistively shunted junction (RSJ) model with thermal fluctuations to get a limiting performance of high-T/sub c/ devices utilizing the AC Josephson effect. The lowest value of the linewidth of 72 GHz Josephson oscillations observed at 77 K was equal to 380 MHz, which demonstrates the applicability of GBJ, particularly in the field of radiation spectroscopy, even at liquid nitrogen temperatures.>
Josephson junction arrays could be competitive candidates for radiation sources in the frequency range from 0.5 to 1.5 THz. This is the range where compact solid-state continuous wave sources are most lacking. We investigated the millimeter-wave radiation from arrays of high-temperature superconductor bicrystal Josephson junctions embedded in a quasi-optical resonator. The novel approach of utilizing the intrinsic resonance modes of the substrate to improve the impedance coupling between the series array of discrete Josephson junctions and the quasi-optical resonator was investigated by experiments and electromagnetic field simulations. Radiation from the arrays containing up to 536 junctions was detected at about 80 GHz and liquid nitrogen temperature using a low-noise receiver. The detected maximum radiation power of the arrays was about 50 pW and the peak voltage agreed exactly with the Josephson current–voltage relation.
Using high-T/sub c/ grain boundary Josephson junctions (GBJJs) made of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// deposited across silicon bicrystal boundary, we successfully demonstrated direct response at frequency as high as 2.525 THz and the operation temperature up to 70 K. Also, the effects of response on polarization of electromagnetic waves and the harmonic mixing properties are investigated. It is found that there is no polarization dependence of the response for our high-quality GBJJs. This result is favorable to the spectroscopy application. At frequency as high as 2.525 THz, the high-order harmonic mixing at zero and finite bias voltage has been demonstrated.