Power efficient THz sources based on Bi-2212 whiskers
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2024-03-02 08:38
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CATTANEO, R., BORODIANSKYI, Ievgenii, KALENYUK, A., SHIIANOV, K., EFIMOV, A., NOVIKOVA, N., KRASNOV, M., AVANZI, Agostino, TRUCCATO, M., KRASNOV, Vladimir. Power efficient THz sources based on Bi-2212 whiskers. In: The 12th international conference on intrinsic Josephson effect and horizons of superconducting spintronics, 22-25 octombrie 2021, Chişinău. Chişinău: 2021, p. 19. ISBN 978-9975-47-215-9.
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The 12th international conference on intrinsic Josephson effect and horizons of superconducting spintronics 2021
Conferința "The 12th international conference on intrinsic Josephson effect and horizons of superconducting spintronics"
Chişinău, Moldova, 22-25 octombrie 2021

Power efficient THz sources based on Bi-2212 whiskers


Pag. 19-19

Cattaneo R.1, Borodianskyi Ievgenii2, Kalenyuk A.13, Shiianov K.41, Efimov A.14, Novikova N.54, Krasnov M.54, Avanzi Agostino6, Truccato M.7, Krasnov Vladimir14
 
1 Stockholm University,
2 Stockholm university, AlbaNova University Center,
3 Физико-технологический институт металлов и сплавов НАН Украины,
4 Moscow Institute of Physics and Technology,
5 Keldysh Institute of Applied Mathematics,
6 Necunoscută, Italia,
7 University of Torino
 
Disponibil în IBN: 16 martie 2022


Rezumat

Low power efficiency is one of the main problems of THz sources, colloquially known as “the THz gap”. Although a big progress was achieved in development of semiconducting quantum cascade lasers, their efficiency drops from 28% at 55 THz to a sub-percent at 3-4 THz and to ~0.01% at 1.3 THz. Here we present prototypes of novel THz devices based on whisker-crystals of a high-temperature superconductor Bi2Sr2CaCu2O. We employ various on-chip and off-chip detection techniques and, in particular, use the radiative cooling phenomenon for accurate evaluation of the emission power. It reveals that the efficiency of our devices can reach 12%. This is more than an order of magnitude larger than for similar devices made on conventional large-size crystals and not far away from the theoretical limit of 50% [1]. The boost of efficiency is attributed to a specific turnstile-antenna-like geometry of devices, which allows a drastic reduction of the parasitic crystal/electrode capacitance and enables good impedance matching with free space. We argue that such devices can be used for creation of tunable, monochromatic, continuous-wave, compact and power-efficient THz sources.