A cryogen-free HTS Josephson junction detector for terahertz imaging

J. Du; K. Smart; L. Li; K. E. Leslie; Stephen Hanham; D. H.C. Wang; C. P. Foley; F. Ji; X. D. Li; D. Z. Zeng

doi:10.1088/0953-2048/28/8/084001

A cryogen-free HTS Josephson junction detector for terahertz imaging

J. Du, K. Smart, L. Li, K. E. Leslie, Stephen Hanham, D. H.C. Wang, C. P. Foley, F. Ji, X. D. Li, D. Z. Zeng

Electronic, Electrical and Systems Engineering

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

A cryogen-free terahertz (THz) imaging system based on a high-temperature superconducting (HTS) Josephson junction detector is reported. The detector was made of a YBa₂Cu₃O_7-x step-edge Josephson junction and integrated into an on-chip thin-film antenna. The HTS Josephson detector was cooled via a commercial mechanical cryocooler; an important step towards cryogen-free THz instrumentation, which is critical for industrial acceptance. In addition, it is shown that operating the detector in a cryocooler provides improved flexibility for optimizing the detector parameters and performance due to the ability to adjust the temperature compared to liquid nitrogen cooling methods. The dc and ac characteristics, the detector responsivity and the noise-equivalent power of the detector, and resulting image quality were studied as the function of operating temperatures.

Original language	English
Article number	084001
Journal	Superconductor Science and Technology
Volume	28
Issue number	8
Early online date	6 Jul 2015
DOIs	https://doi.org/10.1088/0953-2048/28/8/084001
Publication status	Published - 1 Aug 2015

Keywords

cryocooler
high temperature superconductor
Josephson junction detector
terahertz

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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http://iopscience.iop.org/article/10.1088/0953-2048/28/8/084001Licence: None: All rights reserved

Cite this

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title = "A cryogen-free HTS Josephson junction detector for terahertz imaging",

abstract = "A cryogen-free terahertz (THz) imaging system based on a high-temperature superconducting (HTS) Josephson junction detector is reported. The detector was made of a YBa2Cu3O7-x step-edge Josephson junction and integrated into an on-chip thin-film antenna. The HTS Josephson detector was cooled via a commercial mechanical cryocooler; an important step towards cryogen-free THz instrumentation, which is critical for industrial acceptance. In addition, it is shown that operating the detector in a cryocooler provides improved flexibility for optimizing the detector parameters and performance due to the ability to adjust the temperature compared to liquid nitrogen cooling methods. The dc and ac characteristics, the detector responsivity and the noise-equivalent power of the detector, and resulting image quality were studied as the function of operating temperatures.",

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AU - Du, J.

AU - Smart, K.

AU - Li, L.

AU - Leslie, K. E.

AU - Hanham, Stephen

AU - Wang, D. H.C.

AU - Foley, C. P.

AU - Ji, F.

AU - Li, X. D.

AU - Zeng, D. Z.

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AB - A cryogen-free terahertz (THz) imaging system based on a high-temperature superconducting (HTS) Josephson junction detector is reported. The detector was made of a YBa2Cu3O7-x step-edge Josephson junction and integrated into an on-chip thin-film antenna. The HTS Josephson detector was cooled via a commercial mechanical cryocooler; an important step towards cryogen-free THz instrumentation, which is critical for industrial acceptance. In addition, it is shown that operating the detector in a cryocooler provides improved flexibility for optimizing the detector parameters and performance due to the ability to adjust the temperature compared to liquid nitrogen cooling methods. The dc and ac characteristics, the detector responsivity and the noise-equivalent power of the detector, and resulting image quality were studied as the function of operating temperatures.

KW - cryocooler

KW - high temperature superconductor

KW - Josephson junction detector

KW - terahertz

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JF - Superconductor Science and Technology

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A cryogen-free HTS Josephson junction detector for terahertz imaging

Abstract

Keywords

ASJC Scopus subject areas

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