We report a record double sideband noise temperature of 600 K offered by a NbN hot-electron bolometer receiver at 2.5 THz. Allowing for standing wave effects, this value was found to be constant in the intermediate frequency range 1–7 GHz, which indicates that the mixer has an unprecedentedly large noise bandwidth in excess of 7 GHz. The insight into this is provided by gain bandwidth measurements performed at the superconducting transition. They show that the dependence of the bandwidth on the mixer length follows the model for an HEB mixer with diffusion and phonon cooling of the hot electrons.
Low noise and wide bandwidth of NbN hot-electron bolometer mixers
Ivan Tretyakov, Sergey Ryabchun, Matvey Finkel, Anna Maslennikova, Natalia Kaurova, Anastasia Lobastova, Boris Voronov, Gregory Gol’tsman; Low noise and wide bandwidth of NbN hot-electron bolometer mixers. Appl. Phys. Lett. 17 January 2011; 98 (3): 033507. https://doi.org/10.1063/1.3544050
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