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Eigen Waves of a Plane Symmetric Anisotropic Waveguide

Authors: Bikeev O.N.; Lovetskiy K.P.; Sevastianov A.L.;

Eigen Waves of a Plane Symmetric Anisotropic Waveguide

Abstract

Получены точные дисперсионные уравнения для плоского симметричного диэлектрического анизотропного волновода, в котором изотропным является волноведущий слой, а обрамляющие среды предполагаются анизотропными одноосными средами. Тензоры диэлектрической проницаемости обрамляющих сред при этом не предполагаются диагональными, а именно - у одной из них этот тензор образован путём поворота диагонального тензора на некоторый угол между оптической осью анизотропной среды и направлением распространения электромагнитной волны. Тензор диэлектрической проницаемости другой анизотропной среды повёрнут на такой же угол, но в противоположном направлении, при этом оптические оси обеих обрамляющих сред лежат в плоскости, параллельной границам волноведущей структуры. Таким образом, в обрамляющих средах поддерживается существование шестикомпонентных электромагнитных волн. В дисперсионных свойствах такого волновода наблюдаются некоторые особенности, по сравнению со случаем, когда обрамляющие среды предполагаются изотропными. Обнаружено, что первая симметричная мода такого волновода имеет конечное замедление при нулевой толщине изотропного слоя, что говорит о возможности возникновения поверхностных электромагнитных волн (так называемых волн Дьяконова) на границах этого изотропного слоя. Отмечено, что переход антисимметричной моды в Дьяконовскую волну происходит при конечной толщине волноведущего слоя. Приведены зависимости величины замедления элементарной (симметричной) моды от угла поворота оптической оси анизотропных сред относительно направления распространения направляемой волны волноводной структуры. Кроме дисперсионных свойств такого волновода исследованы поперечные распределения полей направляемой электромагнитной волны, приведены точные аналитические выражения для амплитуд полей этой волны.

Precise dispersion equations for a plane symmetric dielectric anisotropic waveguide are obtained, in which the waveguide layer is isotropic, and the framing media are assumed to be anisotropic uniaxial media. The tensors of the dielectric permittivity of the framing media are not assumed to be diagonal, namely, in one of them this tensor is formed by rotating the diagonal tensor by some angle between the optical axis of the anisotropic medium and the direction of propagation of the electromagnetic wave. The tensor of dielectric permittivity of another anisotropic medium is rotated by the same angle, but in the opposite direction, with the optical axes of both framing media lying in a plane parallel to the boundaries of the waveguiding structure. Thus, in framing media, the existence of six-component electromagnetic waves is maintained. In the dispersion properties of such a waveguide, certain features are observed in comparison with the case when the framing media are assumed to be isotropic. It is found that the first symmetric mode of such a waveguide has a finite deceleration with zero thickness of the isotropic layer, which indicates the possibility of the appearance of surface electromagnetic waves (the so-called Dyakonov waves) at the boundaries of this isotropic layer. It is noted that the transition of the antisymmetric mode to the Dyakonov wave occurs with a finite thickness of the waveguiding layer. Dependencies of the deceleration of the elementary (symmetric) mode on the angle of rotation of the optical axis of anisotropic media relative to the direction of propagation of the guided wave of the waveguide structure are given.

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Keywords

поперечное распределение амплитуд, permittivity tensor, anisotropic medium, guided waves, направляемые волны, surface electromagnetic wave, waveguide modes, тензор диэлектрической проницаемости, волноводные моды, поверхностная электромагнитная волна, анизотропная среда, transverse amplitude distribution

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
Green
hybrid