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Ganzevles, W. F. M.; Gao, J. R.; de Korte, P. A. J.; Klapwijk, T. M. |
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Title |
Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers |
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2001 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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79 |
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15 |
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2483-2485 |
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0003-6951 |
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Kasparek, W; Fernandez, A.; Hollmann, F; Wacker, R. |
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Title |
Measurements of ohmic losses of metallic reflectors at 140 GHz using a 3-mirror resonator technique |
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Year |
2001 |
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Int. J. Infrared and Millimeter Waves |
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22 |
Issue |
11 |
Pages |
1695-1707 |
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mirror, reflection index, emissivity, Fabry-Perot interferometer, subterahertz, subTHz |
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Abstract |
The reflectivity of metallic mirrors in the millimeter wave region does not only depend on the material, but also on the structure and roughness of the surface. We have performed measurements of the reflectivity of various plane and grooved metallic and graphite samples at 140 GHz. The technique is based on the comparison of the quality factor of a 2-mirror reference resonator with the quality factor of a 3-mirror resonator which has identical dimensions and includes the mirror to be tested. After a brief presentation of the theory, the set-up is described and the reflection loss for various aluminium and copper mirrors as well as vacuum compatible materials for applications in thermonuclear fusion experiments are presented and discussed. |
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Van Rudd, J.; Johnson, Jon L.; Mittleman, Daniel M. |
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Cross-polarized angular emission patterns from lens-coupled terahertz antennas |
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2001 |
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J. Opt. Soc. Am. B |
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18 |
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10 |
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1524 |
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0740-3224 |
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475 |
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Chen, P. S. |
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Infrared properties of barium stars |
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2001 |
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Astron. Astrophys. |
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A&A |
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372 |
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1 |
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245-248 |
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0004-6361 |
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RPLAB @ s @ |
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415 |
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Kroug, M.; Cherednichenko, S.; Merkel, H.; Kollberg, E.; Voronov, B.; Gol'tsman, G.; Hübers, H. W.; Richter, H. |
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Title |
NbN hot electron bolometric mixers for terahertz receivers |
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Journal Article |
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Year |
2001 |
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IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
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11 |
Issue |
1 |
Pages |
962-965 |
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NbN HEB mixers |
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Sensitivity and gain bandwidth measurements of phonon-cooled NbN superconducting hot-electron bolometer mixers are presented. The best receiver noise temperatures are: 700 K at 1.6 THz and 1100 K at 2.5 THz. Parylene as an antireflection coating on silicon has been investigated and used in the optics of the receiver. The dependence of the mixer gain bandwidth (GBW) on the bias voltage has been measured. Starting from low bias voltages, close to operating conditions yielding the lowest noise temperature, the GBW increases towards higher bias voltages, up to three times the initial value. The highest measured GBW is 9 GHz within the same bias range the noise temperature increases by a factor of two. |
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