8Boris S K, William R M, RolfA M. Optimal choice of material for HEB superconducting mixers. IEEE, 1999, 9:4213-4215
9Guilletc B, Arthursson O, Mechin L, et al. Properties of ultra-thin NbN films for membrane-type THz HEB. J Low Temp Phys, 2008, 151:570-574
10Hajenius M, Baselmans J, Baryshev A, et al. Full characterization and analysis of a terahertz heterodyne receiver based on a NbN hot electron bolometer. J Appl Phys, 2006, 100:074507
