Numerical simulation of thermal and radiative properties of THz sources based on Bi2Sr2CaCu2O8+δ mesa structures
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2024-03-02 08:37
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KRASNOV, M., NOVIKOVA, N., CATTANEO, R., KRASNOV, Vladimir. Numerical simulation of thermal and radiative properties of THz sources based on Bi2Sr2CaCu2O8+δ mesa structures. In: The 12th international conference on intrinsic Josephson effect and horizons of superconducting spintronics, 22-25 octombrie 2021, Chişinău. Chişinău: 2021, pp. 50-51. 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

Numerical simulation of thermal and radiative properties of THz sources based on Bi2Sr2CaCu2O8+δ mesa structures


Pag. 50-51

Krasnov M.12, Novikova N.21, Cattaneo R.3, Krasnov Vladimir32
 
1 Keldysh Institute of Applied Mathematics,
2 Moscow Institute of Physics and Technology,
3 Stockholm University
 
Disponibil în IBN: 18 martie 2022


Rezumat

Impedance matching and self-heating are limiting factors for performance of THz sources based on Bi2Sr2CaCu2O8+δ (Bi-2212) intrinsic Josephson junctions (IJJ’s) *1+. Here we present numerical simulation of thermal and radiative properties of such devices with different structure and geometry. It is demonstrated that electrodes are playing an important role. First, they strongly contribute to heat removal from the mesa, as shown in Fig. 1, and, thus, help in reduction of self-heating. Second, electrodes are acting as microwave antennae and help in impedance matching between the mesa and the open space [2,3], thus, enhancing effectiveness of electromagnetic wave emission. We test various device geometries and conclude that devices based on Bi-2212 whiskers may provide significant advantages because both the electrodes and the whisker itself work as a matching turnstile-type antenna, facilitating significant emission, as shown in Fig. 2. These conclusions are in agreement with recent experimental data on whisker-based devices [4].figureFig. 1. Numerical simulation of temperature distribution in the case when heat removal occurs predominantly via heat-exchange He4 gas. In this case the top electrode acts as a cooling fin and makes the main contribution to heat removal. This is seen from the simple spherical temperature distribution above the electrodefigureFig. 2. Numerical simulation of radiation emission pattern at f = 1 THs from a Bi-2212 whisker-based device with a cross-dipole (turnstile) type geometry. The directionality of emission is following the direction of the whisker. This demonstrates antenna-like operation of the whisker (and the electrodes)