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Fabrication of a diffusion cooled superconducting hot electron bolometer for THz mixing applications

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2 Author(s)
Bumble, B. ; Center for Space Microelectron. Technol., California Inst. of Technol., Pasadena, CA, USA ; LeDuc, H.G.

Recent interest in bolometers for heterodyne mixing applications has prompted development of microbridges which are small enough to allow electron diffusion to dominate over electron-phonon interaction as a cooling mechanism. Prior results at 533 GHz have demonstrated several GHz intermediate frequency (IF) bandwidth. Here we describe our processing method in which the bolometer element is a 10 nm thin film of niobium defined by electron beam lithography down to dimensions of 80 nm. This microbridge is embedded in a normal metal (Au) antenna structure for 1.2 and 2.5 THz applications.

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Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )