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Appl. Phys. Lett. 90, 023507 (2007); http://dx.doi.org/10.1063/1.2430928 (3 pages)

Terahertz mixing in MgB2 microbolometers

S. Cherednichenko1, V. Drakinskiy1, K. Ueda2, and M. Naito2

1Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
2NTT Basic Research Laboratories, 3-1 Wakamiya, Morinosata, Atsugi, Kanagawa 243-0198, Japan

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(Received 13 July 2006; accepted 8 December 2006; published online 11 January 2007)

The authors report on a terahertz (600 GHz) mixing experiment with MgB2 microbolometers in the resistive state. The authors observed that for a 20 nm film a mixer gain bandwidth of 2.3 GHz can be achieved, corresponding to an energy relaxation time of 70 ps. The experimental results were analyzed using a two-temperature model. As a result, the phonon escape time of ∼ 20 ps was deduced. At 1.6 THz the MgB2 mixer uncorrected noise temperature was 11 000 K. The obtained results show that MgB2 bolometers are good prospects for the terahertz range as both broadband mixers and fast direct detectors.

© 2007 American Institute of Physics

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KEYWORDS and PACS

PACS

  • 74.78.-w

    Superconducting films and low-dimensional structures

  • 07.57.Kp

    Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors

  • 95.55.Rg

    Photoconductors and bolometers

  • 84.30.Qi

    Modulators and demodulators; discriminators, comparators, mixers, limiters, and compressors

ARTICLE DATA

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

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