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Lobanov, Y. V.; Tong, Cheuk-Yu E.; Hedden, A. S.; Blundell, R.; Gol'tsman, G. N. |
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Microwave-assisted슠measurement슠of the슠frequency슠response슠of슠terahertz슠HEB슠mixers슠with a슠fourier슠transform슠spectrometer |
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2010 |
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21st International Symposium on Space Terahertz Technology |
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21st ISSTT |
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420-423 |
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HEB mixer |
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We describe a novel method of operation of the HEB direct detector for use with a Fourier Transform Spectrometer. Instead of elevating the bath temperature, we have measured the RF response of waveguide HEB mixers by applying microwave radiation to select appropriate bias conditions. In our experiment, a microwave signal is injected into the HEB mixer via its IF port. By choosing an appropriate injection level, the device can be operated close to the desired operating point. Furthermore, we have shown that both thermal biasing and microwave injection can reproduce the same spectral response of the HEB mixer. However, with the use of microwave injection, there is no need to wait for the mixer to reach thermal equilibrium, so characterisation can be done in less time. Also, the liquid helium consumption for our wet cryostat is also reduced. We have demonstrated that the signalto-noise ratio of the FTS measurements can be improved with microwave injection. |
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RPLAB @ gujma @ |
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725 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Elantiev, A. I.; Karasik, B. S.; Potoskuev, S. E. |
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Intense electromagnetic radiation heating of electrons of a superconductor in the resistive state |
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1988 |
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Sov. J. Low Temp. Phys. |
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Sov. J. Low Temp. Phys. |
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14 |
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7 |
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414-420 |
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HEB |
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Duplicated as 1697 |
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236 |
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Gol'tsman, G. N.; Elant'iev, A. I.; Karasik, B. S.; Gershenzon, E. M. |
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Title |
Antenna – coupled superconducting electron-heating bolometer |
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1993 |
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Proc. 4th Int. Symp. Space Terahertz Technol. |
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Proc. 4th Int. Symp. Space Terahertz Technol. |
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623-628 |
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HEB |
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We propose a novel antenna-coupled superconducting bolometer based on electron-heating in the resistive state. A short narrow ultrathin super- conducting film strip (sized approximately 4x1x0.01 pm 3 ), which is in good thermal contact with the thermostat, serves as a resistive load for infrared or submillimeter current. In contrast to conventional isothermal super- conducting bolometers electron-heating ones can have a higher sensitivity which grows when filni. thickness is reduced. Response time of electron- heating bolometer does not depend on heat transfer from the film to the enviroment. To calculate the sensitivity (NEP), we have used experimental data on wideband Al, Nb and NbN bolometers which have the same un- derlying physical mechanism. The bolom.eters have been made in the form of a structure composed of a number of long narrow strips. The values of for Al, NEP have been found to be 1.5 . 113 -16 1 140 -15 ) and 2 . 10 – 14werT,-1/2 – Nb and NbN respectively. In the paper, the prospects are also discussed of improving the picosecond YBaCuO detector, developed recently. NEP value of the detector, if combined with a microantenna, can reach the order of 10- •ilz-v2. |
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1657 |
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Gershenzon, E. M.; Gershenzon, M. E.; Gol'tsman, G. N.; Semenov, A. D.; Sergeev, A. V. |
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Nonselective effect of electromagnetic radiation on a superconducting film in the resistive state |
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1982 |
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JETP Lett. |
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JETP Lett. |
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36 |
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7 |
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296-299 |
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HEB |
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Неселективное воздействие электромагнитного излучения на сверхпроводящую пленку в резистивном состоянии |
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Gol'tsman, G. N.; Gusinskii, E. N.; Malyavkin, A. V.; Ptitsina, N. G.; Selevko, A. G.; Edel'shtein, V. M. |
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The excitonic Zeeman effect in uniaxially-strained germanium |
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1987 |
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Sov. Phys. JETP |
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Sov. Phys. JETP |
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65 |
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6 |
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1233-1241 |
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Ge, Zeeman effect |
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We have carried out a high-resolution spectroscopic study of the absorption of submillimeter radiation by free excitons in germanium compressed along the [ 1 11 ] axis in a magnetic field parallel to the compression axis. In particular, we studied the splitting of the 1s- 2p transition in fields up to 6 kOe at T = 1.6 K, and observed a complex pattern in the Zeeman splitting which we believe is related to the effect of thermal motion of the excitons in a magnetic field on their internal structure (the magneto-Stark effect). The calculated submillimeter spectrum of excitons agrees with the experimental data. We predict that in a magnetic field the energy of the 2p, term is a minimum at a finite value of the exciton momentum perpendicular to the field-that is, the energy minimum forms a ring in momentum space. It follows that the density of states for this term must be a nonmonotonic function of the energy. A theory is developed of analogous phenomena in positronium. |
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