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European Microwave Conference (EuMC)

Hilbert transform spectrometer using shunted SIS junctions

Alexander N. Vystavkin, Michael A. Tarasov, A. Shul’man, G Prokopenko, V. P. Koshelets, O.Yu. Polyanski, I.L. Lapitskaya, E.L. Kosarev

Published Sep 1, 1995• 0 citations
Publisher

Abstract

A millimeter-wave spectrometer using the Hilbert transformation of the resistively-shunted SIS junction response has been designed, fabricated and experimentally studied. The SIS junctions have been used as a Josephson sensor placed in the center of complementary logarithmic spiral antenna. The response was studied in 75-150 GHz frequency band. The resolution below 1 GHz and noise equivalent power about 10-13-10-14W has been measured for the 0.7 Ω junction. The measured spectrum has been obtained by means of the Hilbert transformation via novel deconvolution program based on the maximum likelihood approach. This allows to diminish the measured interval of bias voltage and to avoid contribution of the noisy part of response curve without loss of the spectral resolution.

DOI
10.1109/euma.1995.337001

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A millimeter-wave spectrometer using the Hilbert transformation of the resistively-shunted SIS junction response has been designed, fabricated and experimentally studied. The SIS junctions have been used as a Josephson sensor placed in the center of complementary logarithmic spiral antenna. The response was studied in 75-150 GHz frequency band. The resolution below 1 GHz and noise equivalent power about 10-13-10-14W has been measured for the 0.7 Ω junction. The measured spectrum has been obtained by means of the Hilbert transformation via novel deconvolution program based on the maximum likelihood approach. This allows to diminish the measured interval of bias voltage and to avoid contribution of the noisy part of response curve without loss of the spectral resolution.
A quasioptical spectrometer using Hilbert transformation of Josephson junction response has been designed, fabricated and experimentally studied. Resistively shunted SIS junctions have been used as the Josephson sensor placed in the centre of a complementary logarithmic spiral antenna. The response was studied in the 75-150 GHz frequency band. A resolution below 1 GHz and noise equivalent power about 10/sup -13/-10/sup -14/ W has been measured for the 0.7 /spl Omega/ junction. The measured spectrum is obtained by means of Hilbert transformation via a novel deconvolution program based on the maximum likelihood approach. This allows one to diminish the measured interval of bias voltage and avoid measurements of the noisy part of the response curve without loss of the spectral resolution.>
A quasioptical Josephson detector with resistively shunted superconducting tunnel junctions of superconductor-insulator-superconductor (SIS) type and different integrated matching circuits for mm waveband region has been designed, fabricated and experimentally studied. A special quasioptical cryogenic probe has been designed and fabricated for measurements of microwave response of such integrated receiving structures. For low-frequency matching a cold transformer has been used at the output port. Many efforts have been made for reducing the external noise influence on Josephson junction IV curve. Quasioptical beamguide has been optimized and adjusted using Bi bolometers evaporated instead of Josephson junctions in the center of planar antenna. Beampatterns of several types of planar antennas, including self-complementary and non-complementary logarithmic spiral and log-periodic antennas, have been measured using the same technique.
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An HTS Josephson spectrometer has been designed, fabricated and experimentally studied. The spectrometer circuit consists of a YBCO bicrystal Josephson junction integrated with a double-slot or log-periodic antenna, connected in parallel with a gold low-inductance shunt. The selective detector response and RF response at intermediate frequency f IF = 1.4 GHz were measured in the signal frequency range f s = 400-1250 GHz and the linewidth of Josephson oscillations (LJO) was determined by using three different methods. (1) The Hilbert spectroscopy approach was used in the processing of the selective detector response. (2) In case of f IF < LJO the detector and RF responses have similar shapes, allowing the spectrum and LJO to be extracted from the RF response and even processing by modified Hilbert spectroscopy. (3) The RF response at f IF > LJO corresponds to the frequency down-conversion in a self-pumped Josephson mixer mode. For the processing of the RF response in the high f IF limit we suggest a novel method that allows extraction of the signal spectrum by means of simple operations: shifting, summing and subtracting. The advantage of the RF response method is in its simplicity and higher sensitivity that allows it to be proposed for spectroscopy applications.
Millimeter-wave detection was investigated using a step-edge microbridge Josephson junction fabricated by a YBaCuO thin film for both the video detection and harmonic mixing detection. Current–voltage (I–V) characteristics, which could be described by the resistively shunted junction (RSJ) model, were obtained up to 70 K with the IcR product of 150 μV at 70 K. The responsivity and noise equivalent input power were calculated as 2400 W/V and 4.4×10−14 W/√Hz, respectively, in the video detection assuming the RSJ model approximation. Clear dependence of the intermediate frequency output on the applied dc bias voltage was observed in the harmonic mixing detection with the harmonic numbers of 5–16, reflecting the change of dynamic resistance at the constant voltage steps induced by the local oscillation signal on the I–V curve. A minimum detection power of −59.4 dB m and a conversion efficiency (η) of −49.6 dB were obtained for the harmonic number (N) of 5 at 60 K. The relationship between the η and N was expressed as η∝N−2.2.