Direct Visualization of Phase-Locking of Large Josephson Junction Arrays by Surface Electromagnetic Waves

Galin, M. A.; Rudau, F.; Borodianskyi, Evgenii A.; Kurin, V. V.; Koelle, D.; Kleiner, R.; Krasnov, Vladimir M.; Клушин, А.М.

doi:10.1103/physrevapplied.14.024051

“…The tolerable dissipation power can be significantly enhanced by spreading it between several smaller emitters [10,19] because smaller mesa structures are less prone to self-heating [14,28,29,31]. Such a strategy has been successfully proved for arrays of Josephson junctions [48][49][50], for which coherent emission from up to 9000 synchronized junctions was reported [49]. Yet, the ultimate dissipation power is limited by the cooling power of the cryostat itself.…”

Section: Discussionmentioning

confidence: 99%

Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties

Krasnov¹,

Novikova²,

Cattaneo³

et al. 2021

Beilstein J. Nanotechnol.

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Impedance matching and heat management are important factors influencing the performance of terahertz sources. In this work we analyze thermal and radiative properties of such devices based on mesa structures of a layered high-temperature superconductor Bi2Sr2CaCu2O8+δ. Two types of devices are considered containing either a conventional large single crystal or a whisker. We perform numerical simulations for various geometrical configurations and parameters and make a comparison with experimental data for the two types of devices. It is demonstrated that the structure and the geometry of both the superconductor and the electrodes play important roles. In crystal-based devices an overlap between the crystal and the electrode leads to appearance of a large parasitic capacitance, which shunts terahertz emission and prevents impedance matching with open space. The overlap is avoided in whisker-based devices. Furthermore, the whisker and the electrodes form a turnstile (crossed-dipole) antenna facilitating good impedance matching. This leads to more than an order of magnitude enhancement of the radiation power efficiency in whisker-based, compared to crystal-based, devices. These results are in good agreement with presented experimental data.

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“…The tolerable dissipation power can be significantly enhanced by spreading it between several smaller emitters [10,19] because smaller mesa structures are less prone to self-heating [14,27,28,30]. Such a strategy has been successfully proved for arrays of Josephson junctions [45][46][47], for which coherent emission from up to 9000 synchronized junctions was reported [46]. Yet, the ultimate dissipation power is limited by the cooling power of the cryostat itself.…”

Section: Discussionmentioning

confidence: 99%

Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties

Krasnov¹,

Novikova²,

Cattaneo³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Impedance matching and heat management are important factors influencing performance of THz sources. In this work we analyze thermal and radiative properties of such devices based on mesa structures of a layered high-temperature superconductor Bi2Sr2CaCu2O8+δ. Two types of devices are considered, containing either a conventional large single crystal, or a whisker. We perform numerical simulations for various geometrical configurations and parameters and make a comparison with experimental data for the two types of devices. It is demonstrated that the structure and the geometry of both the superconductor and the electrodes are playing important roles. In crystal-based devices an overlap between the crystal and the electrode leads to appearance of a large parasitic capacitance, which shunts THz emission and prevents impedance matching with open space. The overlap is avoided in whisker-based devices. Furthermore, the whisker and the electrodes form a turnstile (crossed-dipole) antenna facilitating good impedance matching. This leads to more than an order of magnitude enhancement of the radiation power efficiency in whisker-based, compared to crystal-based devices. These results are in good agreement with presented experimental data.

show abstract

“…The tolerable dissipation power can be significantly enhanced by spreading it between several smaller emitters [10,19] because smaller mesa structures are less prone to self-heating [14,28,29,31]. Such a strategy has been successfully proved for arrays of Josephson junctions [48][49][50], for which coherent emission from up to 9000 synchronized junctions was reported [49]. Yet, the ultimate dissipation power is limited by the cooling power of the cryostat itself.…”

Section: Discussionmentioning

confidence: 99%

Design aspects of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ THz sources: optimization of thermal and radiative properties

Krasnov,

Novikova,

Cattaneo

et al. 2021

Preprint

0

View full text Add to dashboard Cite

Impedance matching and heat management are important factors influencing performance of THz sources. In this work we analyze thermal and radiative properties of such devices based on mesa structures of a layered high-temperature superconductor Bi 2 Sr 2 CaCu 2 O 8+𝛿 . Two types of devices are considered, containing either a conventional large single crystal, or a whisker. We perform numerical simulations for various geometrical configurations and parameters and make a comparison with experimental data for the two types of devices. It is demonstrated that the structure and the geometry of both the superconductor and the electrodes are playing important roles. In crystal-based devices an overlap between the crystal and the electrode leads to appearance of a large parasitic 1

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Direct Visualization of Phase-Locking of Large Josephson Junction Arrays by Surface Electromagnetic Waves

Cited by 18 publications

References 48 publications

Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties

Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties

Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties

Design aspects of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ THz sources: optimization of thermal and radiative properties

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Direct Visualization of Phase-Locking of Large Josephson Junction Arrays by Surface Electromagnetic Waves

Cited by 18 publications

References 48 publications

Design aspects of Bi2Sr2CaCu2O8+δ THz sources: optimization of thermal and radiative properties

Design aspects of Bi2Sr2CaCu2O8+δ THz sources: optimization of thermal and radiative properties

Design aspects of Bi2Sr2CaCu2O8+δ THz sources: optimization of thermal and radiative properties

Design aspects of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ THz sources: optimization of thermal and radiative properties

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Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties

Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties

Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties