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SOFIA – stratospheric observatory for infrared astronomy |
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2007 |
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RPLAB @ s @ SOFIA_proj |
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404 |
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SRON-TELIS |
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RPLAB @ s @ TELIS_proj |
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405 |
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Torgashin, M. Yu.; Koshelets, V. P.; Dmitriev, P. N.; Ermakov, A. B.; Filippenko, L. V.; Yagoubov, P. A. |
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Superconducting integrated receivers based on Nb-AlN-NbN circuits |
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2007 |
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IEEE Trans. Appl. Supercond. |
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17 |
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2 |
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379-382 |
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RPLAB @ s @ mix_SIR_ieee_trans_2007 |
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406 |
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Smirnov, K.; Korneev, A.; Minaeva, O.; Divochiy, A.; Tarkhov, M.; Ryabchun, S.; Seleznev, V.; Kaurova, N.; Voronov, B.; Gol'tsman, G.; Polonsky, S. |
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Ultrathin NbN film superconducting single-photon detector array |
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2007 |
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J. Phys.: Conf. Ser. |
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J. Phys.: Conf. Ser. |
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61 |
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1081-1085 |
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SSPD array |
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We report on the fabrication process of the 2 × 2 superconducting single-photon detector (SSPD) array. The SSPD array is made from ultrathin NbN film and is operated at liquid helium temperatures. Each detector is a nanowire-based structure patterned by electron beam lithography process. The advances in fabrication technology allowed us to produce highly uniform strips and preserve superconducting properties of the unpatterned film. SSPD exhibit up to 30% quantum efficiency in near infrared and up to 1% at 5-μm wavelength. Due to 120 MHz counting rate and 18 ps jitter, the time-domain multiplexing read-out is proposed for large scale SSPD arrays. Single-pixel SSPD has already found a practical application in non-invasive testing of semiconductor very-large scale integrated circuits. The SSPD significantly outperformed traditional single-photon counting avalanche diodes. |
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1742-6588 |
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408 |
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Khosropanah, P.; Gao, J. R.; Laauwen, W. M.; Hajenius, M; Klapwijk, T. M. |
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Low noise NbN hot electron bolometer mixer at 4.3 THz |
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2007 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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91 |
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221111 (1 to 3) |
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NbN HEB mixers, NbN, contacts cleaning |
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We have studied the sensitivity of a superconducting NbN hot electron bolometer mixer integrated with a spiral antenna at 4.3 THz. Using hot/cold blackbody loads and a beam splitter all in vacuum, we measured a double sideband receiver noise temperature of 1300 K at the optimum local oscillator (LO) power of 330 nW, which is about 12 times the quantum noise (hnu/2kB). Our result indicates that there is no sign of degradation of the mixing process at the superterahertz frequencies. Moreover, a measurement method is introduced which allows us for an accurate determination of the sensitivity despite LO power fluctuations. |
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584 |
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