Layered superconductors as nonlinear waveguides for terahertz waves

Savel’ev, Sergey; Yampol’skiı̆, V. A.; Rakhmanov, A. L.; Nori, Franco

doi:10.1103/physrevb.75.184503

Cited by 36 publications

(29 citation statements)

References 36 publications

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“…Note that such a concave profile of ͑y͒ also describes surface Josephson plasma waves localized near the sample boundary. 39,45,46 The middle part ͑the "peak"͒ of the beam cannot have the concave profile of ͑y͒. However, this part of the beam can propagate when Ͻ J due to the nonlinearity.…”

Section: Localized Terahertz Beammentioning

confidence: 99%

Nonlinear electrodynamics in layered superconductors

et al. 2008

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We analyze theoretically the effect of a weak nonlinearity on the propagation of Josephson plasma waves in layered superconductors. The nonlinearity originates from the Josephson relation between the current density across superconducting layers and gauge-invariant phase difference of the order parameter. We show that strong nonlinear effects can be observed for electromagnetic waves with frequency slightly above or slightly below the plasma frequency. We study the nonlinear plasma resonance accompanied by the hysteretic dependence of the wave amplitude on the frequency. This hysteresis transforms the continuous terahertz radiation into a series of short electromagnetic high-amplitude pulses. We also consider the propagation of a nonlinear terahertz beam localized in the direction across the superconducting layers. This phenomenon is an analog of the self-focusing effect in nonlinear optics. The nonlinear phenomena in layered superconductors considered here can be potentially useful for the design of a new generation of terahertz devices.

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Section: Localized Terahertz Beammentioning

confidence: 99%

Nonlinear electrodynamics in layered superconductors

et al. 2008

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“…As a result of the nonlinearity, a number of nontrivial nonlinear phenomena, such as the slowing down of light, self-focusing effects, the pumping of weaker waves by stronger ones, etc. [25,26], can be observed in layered superconductors. As was shown in Refs.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Wood anomalies in the reflectivity of layered superconductors

Apostolov

Maizelis

Sorokina

et al. 2010

Low Temperature Physics

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We study theoretically the excitation of the nonlinear surface Josephson plasma waves in slabs of layered superconductors by the incident plane waves using the prism method in the Otto configuration. The bilateral, symmetrical with respect to magnetic field, excitation is considered. The excitation leads to the resonant suppression of the specular reflection, i.e., to the Wood anomalies. Due to the nonlinearity, the reflectivity resonantly depends not only on the wave frequency ω and the incident angle θ, but on the wave amplitude h as well. We show that the total suppression of the reflectivity can be attained by the appropriate choice of ω, θ, h, and other parameters of the problem. The results of the analytical calculations are supported by numerical simulations.

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“…80, 81, 83, we discuss such phenomena. Some of these (e.g., JPWs self-focusing effects, the pumping of weaker waves by stronger one, the nonlinear plasma resonance [80], and nonlinear surface and waveguide propagation [81]) have analogues in traditional nonlinear optics. In addition, we discuss an unusual stop-light phenomenon caused by both nonlinearity and dissipation [80].…”

Section: Nonlinear Josephson Plasma Wavesmentioning

confidence: 99%

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

et al. 2010

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The recent growing interest in terahertz (THz) and sub-THz science and technology is due to its many important applications in physics, astronomy, chemistry, biology, and medicine, including THz imaging, spectroscopy, tomography, medical diagnosis, health monitoring, environmental control, as well as chemical and biological identification. We review the problem of linear and nonlinear THz and sub-THz Josephson plasma waves in layered superconductors and their excitations produced by moving Josephson vortices. We start by discussing the coupled sine-Gordon equations for the gauge-invariant phase difference of the order parameter in the junctions, taking into account the effect of breaking the charge neutrality, and deriving the spectrum of Josephson plasma waves.We also review surface and waveguide Josephson plasma waves. The spectrum of these waves is presented, and their excitation is discussed. We review the propagation of weakly nonlinear Josephson plasma waves below the plasma frequency, ω J , which is very unusual for plasma-like excitations.In close analogy to nonlinear optics, these waves exhibit numerous remarkable features, including a self-focusing effect, and the pumping of weaker waves by a stronger one. In addition, an unusual stop-light phenomenon, when ∂ω/∂k ≈ 0, caused by both nonlinearity and dissipation, can be observed in the Josephson plasma waves. At frequencies above ω J , the current-phase nonlinearity can be used for transforming continuous sub-THz radiation into short, strongly amplified, pulses.We also present quantum effects in layered superconductors, specifically, the problem of quantum MQT -macroscopic quantum tunnelling.z-axis is directed across the layers; y-axis is directed along the magnetic field.4

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Layered superconductors as nonlinear waveguides for terahertz waves

Cited by 36 publications

References 36 publications

Nonlinear electrodynamics in layered superconductors

Nonlinear electrodynamics in layered superconductors

Nonlinear Wood anomalies in the reflectivity of layered superconductors

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

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