Transformation of the polarization of THz waves by their reflection and transmission through a finite layered superconductor

The reflection of transverse-electric and transverse-magnetic polarized waves from the surface of a semi-infinite layered superconductor in the presence of external dc magnetic field is studied theoretically. The superconducting layers are assumed to be perpendicular to the boundary of the sample. Due to a strong anisotropy of the irradiated superconductor surface, a transformation of the wave polarization occurs upon the reflection. It is shown that, despite a relatively small penetration depth of the dc magnetic field, it qualitatively affects the field distribution of the electromagnetic wave and, therefore, the reflection and transformation coefficients. Thus, the external dc magnetic field can serve as an efficient tool to control the transformation of the wave polarization. The analytical expressions for the reflection and transformation coefficients are obtained and the parameters at which the most effective transformation of the transverse-electric to transverse-magnetic waves and vice versa occurs are found.

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Transformation of the polarization of the electromagnetic waves reflected from the layered superconductors in an external dc magnetic field

Rokhmanova

Apostolov

Maizelis

et al. 2016

Low Temperature Physics

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Modeling the linewidth dependence of coherent terahertz emission from intrinsic Josephson junction stacks in the hot-spot regime

Gross

Yuan

et al. 2013

Phys. Rev. B

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Recently, it has been found that, when operated at large input power, the linewidth f of terahertz radiation emitted from intrinsic Josephson junction stacks can be as narrow as some megahertz. In this high-bias regime, a hot spot coexists with regions which are still superconducting. Surprisingly, f was found to decrease with increasing bath temperature. We present a simple model describing the dynamics of the stack in the presence of a hot spot by two parallel arrays of pointlike Josephson junctions and an additional shunt resistor in parallel. Heat diffusion is taken into account by thermally coupling all elements to a bath at temperature T b . We present current-voltage characteristics of the coupled system and calculations of the linewidth of the radiation as a function of T b . In the presence of a spatial gradient of the junction parameters' critical current and resistance, f deceases with increasing T b , similar to the experimental observation.

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Thermal and electromagnetic properties ofBi2Sr2CaCu2O8intrinsic Josephson junction stacks studied via one-dimensional coupled sine-Gordon e

et al. 2015

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We used one-dimensional coupled sine-Gordon equations combined with heat diffusion equations to numerically investigate the thermal and electromagnetic properties of a 300 µm long intrinsic Josephson junction stack consisting of N = 700 junctions. The junctions in the stack are combined to M segments where we assume that inside a segment all junctions behave identically. Most simulations are for M = 20. For not too high bath temperatures there is the appearence of a hot spot at high bias currents. In terms of electromagnetic properties, robust standing wave patterns appear in the current density and electric field distributions. These patterns come together with vortex/antivortex lines across the stack that correspond to π kink states, discussed before in the literature for a homogeneous temperature distribution in the stack. We also discuss scaling of the thermal and electromagnetic properties with M , on the basis of simulations with M between 10 and 350.

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Transformation of the polarization of THz waves by their reflection and transmission through a finite layered superconductor

Cited by 4 publications

References 33 publications

Transformation of the polarization of the electromagnetic waves reflected from the layered superconductors in an external dc magnetic field

Transformation of the polarization of the electromagnetic waves reflected from the layered superconductors in an external dc magnetic field

Modeling the linewidth dependence of coherent terahertz emission from intrinsic Josephson junction stacks in the hot-spot regime

Thermal and electromagnetic properties ofBi2Sr2CaCu2O8intrinsic Josephson junction stacks studied via one-dimensional coupled sine-Gordon e

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