Characterization of an STJ-Based Direct Detector of Submillimeter Waves

Ariyoshi, Seiichiro; Matsuo, Hiroshi; Otani, Chiko; Sato, Hiromi; Shimizu, H.M.; Kawase, Kodo; Noguchi, Takashi

doi:10.1109/tasc.2005.850119

Cited by 21 publications

(11 citation statements)

References 7 publications

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“…1͒. 3 The distributed junction array, 4,5 which consists of two series of six parallel STJs placed on a superconducting microstrip line, achieves a broadband coupling of input radiation. Prototype detectors were designed to have the maximum sensitivity at 0.66 THz with a fractional bandwidth of 10%, which fits one of the essential atmospheric transmission windows at the astronomical observation site in Atacama Desert.…”

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Terahertz imaging with a direct detector based on superconducting tunnel junctions

Ariyoshi

Otani

Dobroiu

et al. 2006

Applied Physics Letters

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We demonstrated terahertz imaging using a direct detector based on niobium superconducting tunnel junctions ͑STJs͒. The detector is composed of linearly distributed junctions placed on a superconducting microstrip line and is integrated on two wings of a log-periodic antenna. We succeeded nondestructive imaging for an integrated-circuit card and dry material using the detector around its sensitivity peak ͑ϳ0.66 THz͒. The dynamic range was measured to be higher than 4 ϫ 10 7 ͑76 dB͒. Thus, the STJ detector is applicable to high-sensitivity and high-speed terahertz imaging for various nondestructive inspection applications.

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Terahertz imaging with a direct detector based on superconducting tunnel junctions

Ariyoshi

Otani

Dobroiu

et al. 2006

Applied Physics Letters

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“…Superconductor-insulator-superconductor (SIS) photon detectors with low leakage current can be a candidate of terahertz photon counting detectors, which act similarly to photoconductive detectors [7]. Photon-assisted tunneling process of SIS junction is advantageous for its fast response.…”

Section: Terahertz Photon Counting Detectorsmentioning

confidence: 99%

Advantages of Photon Counting Detectors for Terahertz Astronomy

Matsuo

Ezawa

2016

J Low Temp Phys

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For astronomical observation at terahertz frequencies, a variety of cryogenic detector technologies are being developed to achieve background-limited observation from space, where a noise equivalent power (NEP) of less than 10 −18 W/Hz 0.5 is often required. When each photon signal is resolved in time, the requirements on NEP are reduced and 1 ns time resolution corresponds to an NEP of approximately 10 −17 W/Hz 0.5 at THz frequencies. Furthermore, fast photon counting detectors have a high dynamic range to observe bright terahertz sources such as stars and active galactic nuclei. Applications of photon counting detector are discussed for cosmic microwave background and photon counting terahertz interferometry.

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“…By decreasing the leakage current, NEP could be improved. The basic principles and figure-of-merits of the SIS photon detectors are summarized in the previous papers 4,7 .…”

Section: Characteristics Of Sis Photon Detectorsmentioning

confidence: 99%

Performance of SIS photon detectors for superconductive imaging submillimeter-wave camera (SISCAM)

et al. 2006

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High sensitivity submillimeter-wave focal plane array using SIS photon detector is being developed, which we call SISCAM, the superconductive imaging submillimeter-wave camera. In the course of the detector evaluations, we have measured performance of the SIS photon detectors under various operating conditions. Advantages of the SIS photon detectors are explained by the nature of antenna coupled quantum detectors. Their input coupling can be designed to have band-pass characteristics owing to the distributed junction design. This reduces requirements for infrared blocking filters and enhances optical efficiency. The detector performance is evaluated under background loading and they show background limited performance. Measurement at 4 K shows the SIS photon detector operates under shot noise limit of thermal leakage current and its NEP is 1x10 -14 W/Hz 0.5 , that is better than bolometers at 4.2 K, whereas the same detector has NEP of 10 -16 W/Hz 0.5 at 0.3 K. Dynamic range of SIS photon detectors is estimated to be higher than 10 9 , which surpass the dynamic range achievable with TES bolometers. Nine-element array of SIS photon detector, SISCAM-9, is developed and their performance is evaluated in a submillimeter-wave telescope. With a development of integrated electronics with GaAs-JFET charge integrating readout circuit, the SIS photon detector will be an ideal imaging array in submillimeter-wave region. Due to its large dynamic range and shot noise limited performance under various operating condition, SIS photon detectors can be used for various astronomical instrumentations as well as for other fields of terahertz technologies.

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Characterization of an STJ-Based Direct Detector of Submillimeter Waves

Cited by 21 publications

References 7 publications

Terahertz imaging with a direct detector based on superconducting tunnel junctions

Terahertz imaging with a direct detector based on superconducting tunnel junctions

Advantages of Photon Counting Detectors for Terahertz Astronomy

Performance of SIS photon detectors for superconductive imaging submillimeter-wave camera (SISCAM)

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