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SM ISO690:2012 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 | |
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Pag. 19-19 | |
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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. |
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