Nonreciprocal effects in electrodynamics are of great interest due to their unusual properties and useful applications. We believe that these effects could be observed in superconducting systems like long Josephson junctions. The so-called “flux-flow” regime in such junction consists of a chain of magnetic vortices (fluxons) that are entering on one side and emitting electromagnetic radiation on the other side of the junction. Microwave radiation applied to one edge of a long Josephson junction in flux-flow regime will go through, while the radiation applied to the opposite edge will not propagate. Thus, long Josephson junction works as a microwave diode or isolator, which gives us useful application of considered effect. The task of the present diploma work is to experimentally investigate the nonreciprocal effects on microwaves propagation in long Josephson junctions. This diploma thesis will give you a profound knowledge of superconducting and nonlinear physics, microwaves and cryogenics.
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Sketch of nonreciprocal propagation of microwaves in long Josephson junction.
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