Anisotropic Slab Waveguides Research Articles

Guided Waves In Anisotropic Slabs

Wave propagation through uniaxial and biaxial asymmetric anisotropic dielectric slab waveguides at microwave, millimetric and optical frequencies have been studied in the present paper. Results of the theoretical investigations on propagation constant, cut-off parameter, powerflow, power carrying capacity and attenuation due to lossy dielectric have been presented for different guided modes. Symmetric and asymmetric isotropic structures, treated as special cases of the formulation, have also been presented. The work is then extended to the sensitivity analysis of optical waveguides. The study is useful in design and fabrication of different components in integrated optics.

Investigation of the guided modes in anisotropic diffused slab waveguide with embedded metal layer

Abstract The optical characteristics of the TE and TM guided modes of a multilayer anisotropic two-dimensional waveguide are investigated by using the field component transformation matrix, and also taking into account the substrate intrinsic dispersion. The embedded thin metal layer effects on the propagation constant for both lossless approximated and exact solutions are presented. The lossless approach is accurate enough for the TE waves, but it is not for the TM ones, which exhibit changes of about 10−6 for the equivalent index. The TM modes also present attenuation constant changes between the lossy and weakly-lossy solutions of the order of 9 dB/cm. Several complex field component mappings are drawn, and the surface plasma waves are also examined.

Modes of a symmetric slab optical waveguide in birefringent media - Part I: Optical axis not in plane of slab

We derive the eigenvalue equation and the expressions for the field distribution for the TM modes of an anisotropic symmetric slab waveguide; the TE modes are identical to the isotropic case. It is assumed that the field components do not depend on the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</tex> coordinate and that the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</tex> axis of the uniaxial crystal lies in the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x-z</tex> plane. We find that, in spite of the symmetry of the waveguide, even and odd modes do not exist because the phase fronts of the modes are tilted with respect to the waveguide axis. However, the absolute magnitude of the H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</inf> component of the field has even or odd symmetry. The interesting case of an anisotropic slab waveguide with the optical axis located in the plane of the slab will be presented in Part II of this paper.

Analysis of Electromagnetic-Wave Modes in Anisotropic Slab Waveguide

Electromagnetic-wave modes propagating in anisotropic slab waveguide are analyzed theoretically in detail. The propagation conditions are derived under which waves can propagate along the axis of the guide. A two-dimensional three-layered waveguiding structure consisting of an anisotropic dielectric slab coated on, or immersed in, isotropic surrounding substrate materials is considered as a typical configuration of the guide. Field-intensity distributions of the propagating modes and their propagation constants are obtained by numerical computations. Techniques for achieving the mode discrimination and the single-mode operation are given. Some possible applications in integrated optics are suggested.