Mutually Synchronized Macroscopic Josephson Oscillations Demonstrated by Polarization Analysis of Superconducting Terahertz Emitters

Tsujimoto, Manabu; Fujita, Sg.; Kuwano, Genki; Maeda, Kei‐ichiro; Elarabi, Asem; Hawecker, J.; Tignon, Jérôme; Mangeney, J.; Dhillon, Sukhdeep; Kakeya, Itsuhiro

doi:10.1103/physrevapplied.13.051001

Cited by 25 publications

(24 citation statements)

References 34 publications

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“…Despite a significant progress in this direction [10,12,13,32,33,35,44], it is unlikely that a single emitter would be able to sustain the dissipation power above few tens of mW. 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].…”

Section: Discussionmentioning

confidence: 99%

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

Krasnov¹,

Novikova²,

Cattaneo³

et al. 2021

Preprint

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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.

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Section: Discussionmentioning

confidence: 99%

“…Layered high-temperature superconductor Bi 2 Sr 2 CaCu 2 O 8+ (Bi-2212) may provide an alternative technology for creation of cryogenic THz sources [9][10][11][12][13][14][15][16][17][18][19][20][21]. Bi-2212 represents a natural stack of atomic scale intrinsic Josephson junctions (ĲJ's) [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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

Krasnov¹,

Novikova²,

Cattaneo³

et al. 2021

Preprint

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show abstract

“…The layered high-temperature superconductor Bi-2212 (Bi 2 Sr 2 CaCu 2 O 8+δ ) may provide an alternative possibility for the creation of cryogenic CW THz sources [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Bi-2212 represents a natural stack of atomic scale intrinsic Josephson junctions (IJJs) [23][24][25][26].…”

Section: Introductionmentioning

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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“…A pioneering study performed by Ozyuzer et al [ 21 ] open a new field of THz emitting devices by using high-

Bi2212 single crystals. The characteristics of the electromagnetic waves radiating from these Bi2212-THz emitters are that they are coherent, continuous, widely tunable from 0.3 to 2.4 THz [ 21 , 30 , 31 , 32 ], with even higher frequencies that can be generated up to 11 THz [ 33 ], their narrow spectral linewidth is less than 0.5 GHz [ 34 ], and has even been reported to be as low as 20 MHz [ 35 ], and they are highly polarized, either linearly or circularly [ 36 , 37 ]. Furthermore, Bi2212-THz emitters can be operated at temperatures up to 86 K [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Study of Radiation Characteristics of Intrinsic Josephson Junction Terahertz Emitters with Different Thickness of Bi2Sr2CaCu2O8+δ Crystals

et al. 2021

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The radiation intensity from the intrinsic Josephson junction high-Tc superconductor Bi2Sr2CaCu2O8+δ terahertz emitters (Bi2212-THz emitters) is one of the most important characteristics for application uses of the device. In principle, it would be expected to be improved with increasing the number of intrinsic Josephson junctions N in the emitters. In order to further improve the device characteristics, we have developed a stand alone type of mesa structures (SAMs) of Bi2212 crystals. Here, we understood the radiation characteristics of our SAMs more deeply, after we studied the radiation characteristics from three SAMs (S1, S2, and S3) with different thicknesses. Comparing radiation characteristics of the SAMs in which the number of intrinsic Josephson junctions are N∼ 1300 (S1), 2300 (S2), and 3100 (S3), respectively, the radiation intensity, frequency as well as the characteristics of the device working bath temperature are well understood. The strongest radiation of the order of few tens of microwatt was observed from the thickest SAM of S3. We discussed this feature through the N2-relationship and the radiation efficiency of a patch antenna. The thinner SAM of S1 can generate higher radiation frequencies than the thicker one of S3 due to the difference of the applied voltage per junctions limited by the heat-removal performance of the device structures. The observed features in this study are worthwhile designing Bi2212-THz emitters with better emission characteristics for many applications.

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Mutually Synchronized Macroscopic Josephson Oscillations Demonstrated by Polarization Analysis of Superconducting Terahertz Emitters

Cited by 25 publications

References 34 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

Study of Radiation Characteristics of Intrinsic Josephson Junction Terahertz Emitters with Different Thickness of Bi2Sr2CaCu2O8+δ Crystals

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Mutually Synchronized Macroscopic Josephson Oscillations Demonstrated by Polarization Analysis of Superconducting Terahertz Emitters

Cited by 25 publications

References 34 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

Study of Radiation Characteristics of Intrinsic Josephson Junction Terahertz Emitters with Different Thickness of Bi2Sr2CaCu2O8+δ Crystals

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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