Observation of coherent microwave radiation emitted by coupled Josephson junctions

Finnegan, T.F.; Wahlsten, S.

doi:10.1063/1.1654250

Cited by 71 publications

(26 citation statements)

References 12 publications

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“…A potential escape from this dilemma appeared more than two decades ago, when it was realized [1] that coherent arrays of Josephson oscillators should, in principle, exhibit "superradiance" for which the emitted power would scale as the square of the number of sources in the array. The first observation of superradiant emission, for a pair of junctions, was reported by Finnegan and Wahlsten [2]. The expected coherence-induced narrowing of the linewidth was confirmed by Varmazis et al [3], again for a system of two coupled microbridges.…”

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confidence: 81%

Hyperradiance from phase-locked soliton oscillators

Grønbech‐Jensen

Blackburn

1993

Phys. Rev. Lett.

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confidence: 81%

Hyperradiance from phase-locked soliton oscillators

Grønbech‐Jensen

Blackburn

1993

Phys. Rev. Lett.

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“…The frequency is about one hundred gigahertz because of the small superconducting energy gap for conventional superconductors. [3,4,5,6] Although one may integrate a large array of Josephson junctions made of conventional superconductors on a chip to enhance the radiation power, [7,8,9,10] the frequency is still below terahertz. The discovery of intrinsic Josephson junctions in layered high-T c superconductors, such as Bi 2 Sr 2 CaCu 2 O 8+δ (BSCCO) provides a very nice candidate for terahertz oscillator.…”

Section: Introductionmentioning

confidence: 99%

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Lin

2009

Phys. Rev. B

174

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We present a theoretical description of the phase dynamics and its corresponding electrodynamics in a stack of inductively coupled intrinsic Josephson junctions of layered high-Tc superconductors in the absence of an external magnetic field. Depending on the spatial structure of the gauge invariant phase difference, the dynamic state is classified into: state with kink, state without kink, and state with solitons. It is revealed that in the state with phase kink, the plasma is coupled to the cavity and the plasma oscillation is enhanced. In contrast, in the state without kink, the plasma oscillation is weak. It points a way to enhance the radiation of electromagnetic from high-Tc superconductors. We also perform numerical simulations to check the theory and a good agreement is achieved. The radiation pattern of the state with and without kink is calculated, which may serve as a fingerprint of the dynamic state realized by the system. At last, the power radiation of the state with solitons is calculated by simulations. The possible state realized in the recent experiments is discussed in the viewpoint of the theoretical description. The state with kink is important for applications including terahertz generators and amplifiers.

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“…A significant practical difficulty has always been the relatively small amount of radiation which can be coupled out of such an oscillator. There have been many studies [1][2][3][4][5] attempting to exhibit the observation of superradiant emission from phase-locked soliton oscillators, realizing the coherent arrays of Josephson oscillator, and to confirm the theoretical and experimental investigation for the system of the long Josephson junctions of larger arrays. Long Josephson junctions sustain soliton oscillators, and have also been the focus of considerable attention because of their possible use as sources of radiation.…”

Section: Introductionmentioning

confidence: 98%