2010
DOI: 10.1063/1.3503279
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Noise temperature and beam pattern of an NbN hot electron bolometer mixer at 5.25 THz

Abstract: We report the measured sensitivities of a superconducting NbN hot electron bolometer ͑HEB͒ heterodyne receiver at 5.25 THz. Terahertz ͑THz͒ radiation is quasioptically coupled to a HEB mixer with a lens and a spiral antenna. Using a measurement setup with black body calibration sources and a beam splitter in vacuo, and an antireflection coated Si lens, we obtained a double sideband ͑DSB͒ receiver noise temperature ͑T rec DSB ͒ of 1150 K, which is nine times h / 2k, where h is the Planck constant, the frequency… Show more

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Cited by 38 publications
(27 citation statements)
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“…For heterodyne mixing at 4.7 THz, we use a single pixel HEB in a quasi-optical configuration. The HEB is a 2 x 0.2 μm 2 superconducting NbN bridge coupled to a tight wound spiral antenna that is shown to give excellent response at super-THz frequencies up to at least 5.3 THz [9]. THz radiation is coupled into the HEB antenna using a 10 mm diameter Si elliptical lens, which is AR coated for ~ 25 % improved transmission.…”
Section: Heb Mixermentioning
confidence: 99%
“…For heterodyne mixing at 4.7 THz, we use a single pixel HEB in a quasi-optical configuration. The HEB is a 2 x 0.2 μm 2 superconducting NbN bridge coupled to a tight wound spiral antenna that is shown to give excellent response at super-THz frequencies up to at least 5.3 THz [9]. THz radiation is coupled into the HEB antenna using a 10 mm diameter Si elliptical lens, which is AR coated for ~ 25 % improved transmission.…”
Section: Heb Mixermentioning
confidence: 99%
“…3 Despite the apparent advantage over SIS, HEB mixers show an excellent noise performance in a rather limited IF band: the 3 dB noise bandwidth (NBW) of NbN HEB mixers (currently, the most frequently used HEB mixers) is not more than 4-5 GHz. [4][5][6] The IF range >5 GHz becomes unusable.…”
mentioning
confidence: 99%
“…In addition, we have also participated in the efforts of Netherland Institute for Space Research (SRON) and Delft University of Technology (TUDelft) on the development of superconducting HEB mixers around 5 THz and the integration of THz superconducting HEB mixers with THz quantum cascade lasers (QCLs). The measured noise performances are all summarized in Figure 2 [27][28][29][30][31][32]. Note that low frequency results were measured earlier with no specific optimization of the measurement setup.…”
Section: Superconducting Heb Mixersmentioning
confidence: 99%