Registration Number
0219U102177,
0119U103224
, R & D reports
Title
Terahertz Josephson Plasmonics Controlled by Static Magnetic Field
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Head
Rokhmanova Tetiana M.,
Registration Date
20-12-2019
Organization
O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine
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Layered superconductors are periodic structures in which thin superconducting layers are electrodynamically related through the thicker insulator ones by means of intrinsic Josephson effect. Since the current across the structure has Josephson nature, electrodynamics equations in layered superconductors are nonlinear. The anisotropy of the layered superconductors supports the propagation of waves of terahertz frequency range, which is actively developing due to the variety of interesting applications. In the current project, the effect of external dc magnetic field on the resonant transmission of terahertz waves through the system that consists of a layered superconductor and two insulators was studied. The problem was considered in the transfer-matrix approach. In the project, the transfer-matrixes that describe the effect of dc magnetic field on the waves propagation in the layered superconductor are obtained and the expression for the transmission coefficient through the whole system is received. Besides, the dispersion equations for symmetric and antisymmetric modes are calculated and the effect of dc magnetic field on the dispersion law of these modes is analyzed. In particular, it is shown that the increase of the magnetic field causes the shift of the dispersion curves to the low-frequency region. It is demonstrated in the project that the resonance amplification of the transmission of the waves through the system is related to the localized modes excitation. This well-known phenomenon has peculiarities due to the anomalous dispersion of the localized Josephson plasma waves. In addition, the nonlinearity of the plasma enables effective control of the localized waves by means of dc magnetic field. As a result, the region of maximal transmission can be adjusted using the dc magnetic field. Thus, at fixed frequency and incident angle one can observe the resonance amplification of the transmission through the studied system by changing the external dc magnetic f
Product Description
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Kadygrob Dmytro V.
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2020-04-02
