High-Tc micro and nano-constrictions modeling: hot spot approach for DC characteristics and HEB THz mixer performance

Abstract : High-TC hot electron bolometers (HEB) are promising THz mixers due to their expected wide bandwidth, large mixing gain, and low intrinsic noise. We have simulated the characteristics of YBaCuO HEBs with a hot spot model usually dedicated to low-TC phonon cooled devices. With respect to e.g., NbN, the high-TC specificities are mainly arising from the large values of YBaCuO phonon thermal conductivity, and the film to MgO substrate phonon escape time. The consequent effects on the electron temperature profiles along the YBaCuO constriction and the current voltage DC characteristics are considered. The conversion gain G and noise temperature TN were computed for two constriction dimensions. For a 100 nm long × 100 nm wide × 10 nm thick constriction at 9 microwatt local oscillator (LO) power, the expected double sideband (DSB) TN = 1520 K (G = −13.7 dB). For a larger (but more realistic according to YBaCuO aging effects) 400 nm long × 400 nm wide × 35 nm thick constriction, minimum TN = 1210 K DSB at 35 microwatt LO power (G = −13.1 dB).
Type de document :
Article dans une revue
Journal of Physics: Conference Series, IOP Publishing, 2014, 507 (4), pp.042020. 〈10.1088/1742-6596/507/4/042020〉
Liste complète des métadonnées

https://hal-supelec.archives-ouvertes.fr/hal-01094418
Contributeur : Thierry Leblanc <>
Soumis le : vendredi 12 décembre 2014 - 11:56:00
Dernière modification le : lundi 21 mai 2018 - 01:13:39

Lien texte intégral

Identifiants

Collections

Citation

Romain Ladret, Alain Kreisler, Annick Dégardin. High-Tc micro and nano-constrictions modeling: hot spot approach for DC characteristics and HEB THz mixer performance. Journal of Physics: Conference Series, IOP Publishing, 2014, 507 (4), pp.042020. 〈10.1088/1742-6596/507/4/042020〉. 〈hal-01094418〉

Partager

Métriques

Consultations de la notice

76