Direct detection effect in small volume hot electron bolometer mixers
| Autor: | M. Hajenius, Jochem J. A. Baselmans, S.V. Antipov, Boris M. Voronov, Yu. B. Vachtomin, T. M. Klapwijk, G.N. Gol'tsman, Andrey M. Baryshev, J. R. Gao, S. N. Maslennikov, S. F. Reker |
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| Přispěvatelé: | Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Physics and Astronomy (miscellaneous)
Radiowave and microwave technology phonons infrared submillimeter wave microwave and radiowave receivers and detectors niobium compounds law.invention Telescope Optics Band-pass filter law Calibration TERAHERTZ MIXER Physics Noise temperature Operating point Photoconductors and bolometers band-pass filters business.industry Bolometer submillimetre wave detectors sensitivity calibration Bolometers submillimetre wave receivers NOISE TEMPERATURE hot carriers business Sensitivity (electronics) submillimetre wave mixers Voltage |
| Zdroj: | Applied Physics Letters, 86 (16), 2005 Applied Physics Letters, 86(16):163503 |
| ISSN: | 0003-6951 |
| Popis: | We measure the direct detection effect in a small volume (0.15??m×1??m×3.5?nm) quasioptical NbN phonon cooled hot electron bolometer mixer at 1.6?THz. We find that the small signal sensitivity of the receiver is underestimated by 35% due to the direct detection effect and that the optimal operating point is shifted to higher bias voltages when using calibration loads of 300?K and 77?K. Using a 200?GHz bandpass filter at 4.2?K the direct detection effect virtually disappears. This has important implications for the calibration procedure of these receivers in real telescope systems. |
| Databáze: | OpenAIRE |
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