Article Dans Une Revue Applied Physics Letters Année : 1995

Performance limitations of niobium-based submillimeter-wave quasiparticle mixers operating near the gap frequency

Résumé

We have measured the noise temperature of heterodyne receivers employing Nb/AlOx/Nb tunnel junction mixers at frequencies ranging from 70% to 93% of the gap frequency of niobium (∼700 GHz). The sensitivity of the receiver is decreased by the overlap of the n=1 and n=2 photon steps of opposite sign. At bias voltages where these photon steps overlap, there is an increase in receiver noise up to 50%. Theoretical calculations using the Tucker theory agree well with the observed mixer performance. This overlap already affects the receiver operation for best performance at frequencies well below 700 GHz.

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hal-04892631 , version 1 (16-01-2025)

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Pascal Febvre, M. Salez, W. Mcgrath, B. Bumble, H. Leduc. Performance limitations of niobium-based submillimeter-wave quasiparticle mixers operating near the gap frequency. Applied Physics Letters, 1995, 67 (3), pp.424-426. ⟨10.1063/1.114620⟩. ⟨hal-04892631⟩

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