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Journal of Engineering Science and Technology Review

Design and Simulation of a Millimeter and Submillimeter Detector Utilizing a High-Temperature Superconductor Josephson Junction

Zahra Ehsani, Mahboobeh Baghi Hedeshi, Seyed Mohammad Hassan Javadzadeh

Published Jan 1, 2024• 0 citations
Publisher

Abstract

Superconducting detectors play a crucial role in astronomy, particularly at millimeter and sub-millimeter wavelengths, due to their high sensitivity, ease of fabrication, and potential for integration into large arrays.Josephson junction detectors, which utilize high-temperature superconductors, offer a promising design option because they can operate at higher temperatures.In this paper, we aim to design and simulate two detectors based on high-temperature Josephson junctions for millimeter and sub-millimeter waves.To achieve this goal, we employed the Riblet directional coupler to develop detector arrays.We evaluated the frequency response, quality factor, and loss in these detectors.The experimental results indicate that constructing larger arrays and reducing the gap between the coupler and resonators can enhance the quality factor.We demonstrate this improvement by presenting the quality factors for two different gaps in each spectrum.

DOI
10.25103/jestr.174.15

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Superconducting detectors play a crucial role in astronomy, particularly at millimeter and sub-millimeter wavelengths, due to their high sensitivity, ease of fabrication, and potential for integration into large arrays.Josephson junction detectors, which utilize high-temperature superconductors, offer a promising design option because they can operate at higher temperatures.In this paper, we aim to design and simulate two detectors based on high-temperature Josephson junctions for millimeter and sub-millimeter waves.To achieve this goal, we employed the Riblet directional coupler to develop detector arrays.We evaluated the frequency response, quality factor, and loss in these detectors.The experimental results indicate that constructing larger arrays and reducing the gap between the coupler and resonators can enhance the quality factor.We demonstrate this improvement by presenting the quality factors for two different gaps in each spectrum.
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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.
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.
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