The crossover between the electron–phonon relaxation and the diffusion transport of hot electrons in an NbC microbolometer has been studied. At least an 80 ps relaxation time can be achieved in 0.2 μm long bridges of the material with a diffusivity of 8 cm2/s. The high diffusivity is accompanied by a large sheet resistance (≊10 Ω) that simplifies the match of the mixer device made of NbC to planar antenna at terahertz frequencies. The intrinsic noise mechanisms imply a very low mixer noise temperature of the order of a few tens of Kelvin, independent on the radiation frequency.
REFERENCES
1.
E. M. Gershenzon, G. N. Gol’tsman, I. G. Gogidze, Y. P. Gusev, A. I. Elantev, B. S. Karasik, and A. D. Semenov, Sverhprovodimost’ (KIAE) 3, 2143 (1990) [Sov. Phys. Supercond. 3, 1582 (1990)].
2.
3.
A.
Skalare,
W. R.
McGrath,
B.
Bumble,
H. G.
LeDuc,
P. J.
Burke,
A. A.
Verhejen
, and D. E.
Prober,
IEEE Trans. Appl. Supercond.
5
, 2236
(1995
).4.
G. N.
Gol’tsman,
B. S.
Karasik,
O. V.
Okunev,
A. L.
Dzardanov,
E. M.
Gershenzon,
H.
Ekström,
S.
Jacobsson
, and E.
Kollberg,
IEEE Trans. Appl. Supercond.
5
, 3065
(1995
).5.
B. S.
Karasik,
G. N.
Gol’tsman,
B. M.
Voronov,
S. I.
Svechnikov,
E. M.
Gershenzon,
H.
Ekström,
S.
Jacobsson,
E.
Kollberg
, and K. S.
Yngvesson,
IEEE Trans. Appl. Supercond.
5
, 2232
(1995
).6.
H. Ekström, B. Karasik, E. Kollberg, G. Gol’tsman, and E. Gershenzon, Proceedings of the 6th International Symposium on Space Terahertz Technology, Caltech, Pasadena, March 21–23, 1995, pp. 269–283.
7.
E. Gerecht, C. F. Musante, C. R. Lutz, Jr., Z. Wang, J. Bergendahl, K. S. Yngvesson, E. R. Mueller, J. Waldman, G. N. Gol’tsman, B. M. Voronov, and E. M. Gershenzon, Proceeding of the 1995 International Semiconductor Devices Research Symposium (University of VA Press, Dec. 1995 in press).
8.
B. S. Karasik and A. I. Elantev, Proceedings of the 6th International Symposium on Space Terahertz Technology, Caltech, Pasadena, March 21–23, 1995, pp. 229–246; Appl. Phys. Lett. 68, 853 (1996).
9.
E. V.
Pechen’,
S. I.
Krasnosvobodtsev,
M. P.
Shabanova,
E. V.
Ekimov,
A. V.
Varlashkin,
V. S.
Nozdrin,
A. M.
Tschovrebov
, and A. I.
Golovashkin,
Physica C
235–240
, 2511
(1994
).10.
11.
A. I. Golovashkin, B. G. Zhurkin, A. L. Karuzskii, S. I. Krasnosvobodtsev, V. P. Martovitskii, E. V. Pechen’, V. V. Rodin, Yu. I. Stepanov, and A. V. Shirkov, Fiz. Tverd. Tela 28, 3342 (1986) [Sov. Phys. Solid State 28, 1881 (1986)].
12.
B. J.
Dalrymple,
S. A.
Wolf,
A. C.
Ehrlich
, and D. J.
Gillespie,
Phys. Rev. B
33
, 7514
(1986
).13.
E. M. Gershenzon, M. E. Gershenzon, G. N. Gol’tsman, A. M. Ljul’kin, A. D. Semenov, and A. V. Sergeev, Zh. Éksp. Teor. Fiz. 97, 901 (1990) [Sov. Phys. JETP 70, 505 (1990)].
14.
15.
16.
E. M. Gershenzon, G. N. Gol’tsman, A. I. Elantev, B. S. Karasik, and S. E. Potoskuev, Fiz. Nizk. Temp. 14, 753 (1988) [Sov. J. Low Temp. Phys. 14, 414 (1988)].
17.
K. S. Il’in, B. S. Karasik, N. G. Ptitsina, G. N. Gol’tsman, and E. M. Gershenzon (unpublished).
18.
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