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Softwaretechnik-Trends

Highly Sensitive NbN Hot Electron Bolometer Mixer at 5.25 THz

W. Zhang, P. Khosropanah, Tanish Aggarwal, J. R. Gao, T. M. Klapwijk, Wei Miao, S. C. Shi

Published Apr 1, 2009• 0 citations
OpenAlex

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2.5 THz heterodyne receiver with NbN hot-electron-bolometer mixer

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Noise performance of NbN Hot Electron Bolometer mixers at 2.5 THz and its dependence on the contact resistance

J. J. A. Baselmans, Merlijn Hajenius, J. R. Gao +4 more

•Apr 1, 2003•7 citations

Enhanced Sensitivity of THz NbN Hot Electron Bolometer Mixers

B. Mirzaei, J. R. G. Silva, W. J. Vreeling +3 more

We studied the effect of the NbN/Au contact on the sensitivities of a NbN hot electron bolometer (HEB) mixer by measuring the double sideband (DSB) receiver noise temperature (T_rec_DSB) at three local oscillator frequencies of 1.6, 2.5 and 5.3 THz. The HEB has cleaned contact structures with a thick Au layer. We demonstrated low mixer noise temperatures (T_mixer_DSB) of 240 K and 290 K at 1.6 and 2.5 THz, respectively. The latter reach roughly 3 times the quantum noise at their frequencies. The mixer is developed for the proposed OASIS and SALTUS (concept) missions. The enhanced T_mixer_DSB are more than 30 % better in comparison with published NbN HEB mixers. The improvement can reduce the integration time of a heterodyne instrument roughly by a factor of 2. The T_mixer^DSB of the same HEB has shown limited improvement at 5.3 THz, which is partly due to non-optimized antenna geometry. Besides, the results also help to understand device physics of a wide HEB (4 um) at high frequencies.

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350 GHz NbN Hot Electron Bolometer Mixer

Hans Erik Ekström, Boris S. Karasik, E. Kollberg +2 more

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Noise performance of quasioptical ultrathin NbN hot-electron bolometer mixer at 2.5 and 3.8 THz

Sergey V. Antipov, Yu.B. Vachtornin, S. N. Maslennikov +5 more

To put space-based and airborne heterodyne instruments into operation at frequencies above 1 THz the superconducting NbN hot-electron bolometer (HEB) will be incorporated into heterodyne receiver as a mixer. At frequencies above 1.3 THz the sensitivity of the NbN HEB mixers outperform the one of the Schottky diodes and SIS-mixers, and the receiver noise temperature of the NbN HEB mixers increase with frequency. In this paper we present the results of the noise temperature measurements within one batch of NbN HEB mixers based on 3.5 mn thick superconducting NbN film grown on Si substrate with MgO buffer layer at the LO frequencies 2.5 THz and 3.8 THz.

International Kharkiv Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves•Oct 26, 2004•0 citations

NbN hot-electron bolometer mixers.

K. H. Gundlach, Thomas Lehnert, C. Rösch +4 more

•Jan 1, 1998•0 citations
We studied the effect of the NbN/Au contact on the sensitivities of a NbN hot electron bolometer (HEB) mixer by measuring the double sideband (DSB) receiver noise temperature (T_rec_DSB) at three local oscillator frequencies of 1.6, 2.5 and 5.3 THz. The HEB has cleaned contact structures with a thick Au layer. We demonstrated low mixer noise temperatures (T_mixer_DSB) of 240 K and 290 K at 1.6 and 2.5 THz, respectively. The latter reach roughly 3 times the quantum noise at their frequencies. The mixer is developed for the proposed OASIS and SALTUS (concept) missions. The enhanced T_mixer_DSB are more than 30 % better in comparison with published NbN HEB mixers. The improvement can reduce the integration time of a heterodyne instrument roughly by a factor of 2. The T_mixer^DSB of the same HEB has shown limited improvement at 5.3 THz, which is partly due to non-optimized antenna geometry. Besides, the results also help to understand device physics of a wide HEB (4 um) at high frequencies.
To put space-based and airborne heterodyne instruments into operation at frequencies above 1 THz the superconducting NbN hot-electron bolometer (HEB) will be incorporated into heterodyne receiver as a mixer. At frequencies above 1.3 THz the sensitivity of the NbN HEB mixers outperform the one of the Schottky diodes and SIS-mixers, and the receiver noise temperature of the NbN HEB mixers increase with frequency. In this paper we present the results of the noise temperature measurements within one batch of NbN HEB mixers based on 3.5 mn thick superconducting NbN film grown on Si substrate with MgO buffer layer at the LO frequencies 2.5 THz and 3.8 THz.