ISSTT Proceedings

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Development of 1.5 THz Waveguide NbTiN HEB Mixers

Authors:
L. Jiang, T. Yamakura, Y. Irimajiri, K. Shimbo, S. Shiba, T. Shiino, N. Sakai, P. G. Ananthasubramanian, H. Maezawa, S. Yamamoto
Abstract:
We present results on the design, fabrication, and measurement of 1.5 THz waveguide niobium titanium nitride (NbTiN) superconducting hot electron bolometer (HEB) mixers. The NbTiN HEB mixer element is made from a 12 nm thick NbTiN thin film deposited on a crystalline quartz substrate at room temperature. The Fourier transform spectrometer (FTS) measurement shows that the response of the HEB mixer is centered near 1.3 THz with a bandwidth of about 400 GHz. The uncorrected DSB receiver noise temperature is measured to be 1700 K at 1.5 THz, whereas the mixer noise temperature is 1000 K after correction of quasi-optical and IF chain losses. The required LO power absorbed in the HEB mixer is evaluated to be 340 nW by using an isothermal technique. The IF gain bandwidth is supposed to be about 1.3 GHz or higher. The present results show that good performance can be obtained for the NbTiN HEB mixer even with a relatively thick film (12 nm) fabricated at the room temperature.
Categories:
HEB Mixers, HEB Receivers
Year:
2009
Session:
W2
Full-text:
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Page Number(s):
156-160