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Title: Development of THz waveguide NbTiN HEB mixers
Authors: Jiang, Ling
Shiba, S.
Shimbo, Ken
Sakai, Nami
Yamakura, Tetsuya
Sugimura, Mika
Ananthasubramanian, P.G.
Maezawa, H.
Irimajiri, Y.
Keywords: Terahertz
NbTiN film
Hot electron bolometer mixer
Issue Date: Jun-2009
Publisher: IEEE
Citation: IEEE Transactions on Applied Superconductivity, 2009, Vol.19, p301-304
Abstract: In this paper, we present the development of the waveguide niobium titanium nitride (NbTiN) superconducting hot electron bolometer (HEB) mixers, cryogenically cooled by a 4 K close-cycled refrigerator. The NbTiN thin film is formed on a crystalline quartz substrate by sputtering an NbTi target with the Ar and N2 gas at room temperature. The HEB mixer element is fabricated by using the 12 nm NbTiN film, and is mounted on a waveguide block. Measurement of a Fourier transform spectrometer shows that the response of the mixer is centered near 810 GHz with a bandwidth of about 500 GHz. The uncorrected DSB receiver noise temperature is measured to be 500 K, and the noise bandwidth is to be 1.4 GHz at 810 GHz. The present result shows that a good noise performance can be obtained for the NbTiN HEB mixer even with a relatively thick film (12 nm) fabricated at the room temperature.
Description: Open Access
ISSN: 1051-8223-P
1558-2515 -E
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Appears in Collections:Research Papers (A&A)

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