Low Temperature Physics: 45, 885 (2019); https://doi.org/10.1063/1.5116536
Fizika Nizkikh Temperatur: Volume 45, Number 8 (August 2019), p. 1035-1044    ( to contents , go back )

Anomalous dispersion of oblique terahertz waves localized in a plate of a layered superconductor

S.S. Apostolov1,2, Z.A. Maizelis1,2, D.V. Shimkiv3, A.A. Shmat’ko2, and V.A. Yampol’skii1,2

1Институт радиофизики и электроники им. А.Я. Усикова НАН Украины ул. Академика Проскуры, 12, г. Харьков, 61085, Украина
E-mail: yam@ire.kharkov.ua

2Харьковский национальный университет им. В.Н. Каразина, пл. Свободы, 4, г. Харьков, 61022, Украина

3Department of Physics, University of North Texas, Denton, Texas, 76203, USA
pos Анотація:

Received February 21, 2019, published online June 26, 2019


Localized waves propagating along a plate of finite thickness, made of a layered superconductor with layers perpendicular to the surface of the plate, are studied theoretically. Due to the strong anisotropy of a layered superconductor, the electromagnetic field of a mode is a superposition of ordinary and extraordinary waves, which, in general, cannot be separated from each other. The dispersion law is obtained for an arbitrary direction of propagation of such localized modes with respect to the layers. It is shown that the dispersion curves can be monotonically increasing or non-monotonic, i.e. contain regions with anomalous dispersion. The frequency values, at which anomalous dispersion can be observed, are determined depending on the propagation angle. The frequency dependence on both the modulus and projections of the longitudinal wave vector is analyzed, that may be important for practical applications in the terahertz electronics.

Key words: layered superconductor, longitudinal wave vector, anomalous dispersion.

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