Suspended tunnel junction bolometers for terahertz range

Andrey V. Timofeev (Corresponding Author), Panu Helistö, Leif Grönberg, Arttu Luukanen, Heikki Seppä, Juha Hassel

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature amplifier with feedback. The implemented scheme allows independent impedance matching for the THz antenna and for the readout. Electrical feedback in the readout scheme eliminates the need for magnetic fields to suppress the supercurrent of the junction. We present electrical and preliminary optical measurements of the detectors. We also analyze a possible scheme for time-domain multiplexing.
Original languageEnglish
Pages (from-to)34-40
Number of pages7
JournalThe Open Applied Physics Journal
Volume5
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

bolometers
tunnel junctions
impedance matching
cryogenic temperature
multiplexing
optical measurement
niobium
cryogenics
readout
antennas
amplifiers
pixels
cameras
broadband
high resolution
detectors
room temperature
magnetic fields

Keywords

  • THz imaging
  • bolometers
  • SIS junction

Cite this

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title = "Suspended tunnel junction bolometers for terahertz range",
abstract = "Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature amplifier with feedback. The implemented scheme allows independent impedance matching for the THz antenna and for the readout. Electrical feedback in the readout scheme eliminates the need for magnetic fields to suppress the supercurrent of the junction. We present electrical and preliminary optical measurements of the detectors. We also analyze a possible scheme for time-domain multiplexing.",
keywords = "THz imaging, bolometers, SIS junction",
author = "Timofeev, {Andrey V.} and Panu Helist{\"o} and Leif Gr{\"o}nberg and Arttu Luukanen and Heikki Sepp{\"a} and Juha Hassel",
note = "Project code: 72785",
year = "2012",
doi = "10.2174/1874183501205010034",
language = "English",
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pages = "34--40",
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Suspended tunnel junction bolometers for terahertz range. / Timofeev, Andrey V. (Corresponding Author); Helistö, Panu; Grönberg, Leif; Luukanen, Arttu; Seppä, Heikki; Hassel, Juha.

In: The Open Applied Physics Journal, Vol. 5, 2012, p. 34-40.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Suspended tunnel junction bolometers for terahertz range

AU - Timofeev, Andrey V.

AU - Helistö, Panu

AU - Grönberg, Leif

AU - Luukanen, Arttu

AU - Seppä, Heikki

AU - Hassel, Juha

N1 - Project code: 72785

PY - 2012

Y1 - 2012

N2 - Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature amplifier with feedback. The implemented scheme allows independent impedance matching for the THz antenna and for the readout. Electrical feedback in the readout scheme eliminates the need for magnetic fields to suppress the supercurrent of the junction. We present electrical and preliminary optical measurements of the detectors. We also analyze a possible scheme for time-domain multiplexing.

AB - Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature amplifier with feedback. The implemented scheme allows independent impedance matching for the THz antenna and for the readout. Electrical feedback in the readout scheme eliminates the need for magnetic fields to suppress the supercurrent of the junction. We present electrical and preliminary optical measurements of the detectors. We also analyze a possible scheme for time-domain multiplexing.

KW - THz imaging

KW - bolometers

KW - SIS junction

U2 - 10.2174/1874183501205010034

DO - 10.2174/1874183501205010034

M3 - Article

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SP - 34

EP - 40

JO - The Open Applied Physics Journal

JF - The Open Applied Physics Journal

SN - 1874-1835

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