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Author | Merkel, H. F.; Yagoubov, P. A.; Kroug, M.; Khosropanah, P.; Kollberg, E. L.; Gol’tsman, G. N.; Gershenzon, E. M. | ||||
Title | Noise temperature and absorbed LO power measurement methods for NbN phonon-cooled hot electron bolometric mixers at terahertz frequencies | Type | Conference Article | ||
Year | 1998 | Publication | Proc. 28th European Microwave Conf. | Abbreviated Journal | Proc. 28th European Microwave Conf. |
Volume | 1 | Issue | Pages | 294-299 | |
Keywords | NbN HEB mixers | ||||
Abstract | In this paper the absorbed LO power requirements and the noise performance of NbN based phonon-cooled hot electron bolometric (HEB) quasioptical mixers are investigated for RF frequencies in the 0.55-1.1 range The minimal measured DSB noise temperatures are about 500 K at 640 GHz, 600 K at 750 GHz, 850 K at 910 GHz and 1250 K at 1.1 THz. The increase in noise temperature at 1.1THz is attributed to water absorption. The absorbed LO power is measured using a calorimetric approach. The results are subsequently corrected for lattice heating. These values are compared to results of a novel one dimensional hot spot mixer models and to a more traditional isotherm method which tends to underestimate the absorbed LO power for small bias powers. Typically a LO power between 50nW and 100nW is needed to pump the device to the optimal operating point. | ||||
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Area | Expedition | Conference | 28th European Microwave Conference | ||
Notes | Approved | no | |||
Call Number | Serial | 1580 | |||
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