Performance of NbN lattice‐cooled hot‐electron bolometric mixers

摘要: The heterodyne performance of lattice‐cooled hot‐electron bolometric mixers is measured at 200 GHz. Superconducting thin‐film niobium nitride strips with ∼5 nm thickness are used as waveguide mixer elements. A double‐sideband receiver noise temperature 750 K 244 GHz an intermediate frequency centered 1.5 500 MHz bandwidth and 4.2 device temperature. instantaneous for this 1.6 local oscillator power required by the about 0.5 μW. linear to within 1 dB up input level 6 below power. incorporating a was detect molecular line emission in laboratory gascell. This experiment unambiguously confirms that determined from Y‐factor measurements reflects true sensitivity.