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Investigation of the existence domain for Dyakonov surface waves in the Sage computer algebra system
- Authors: Kroytor O.K.1
-
Affiliations:
- Peoples’ Friendship University of Russia (RUDN University)
- Issue: Vol 29, No 2 (2021)
- Pages: 114-125
- Section: Articles
- URL: https://journals.rudn.ru/miph/article/view/26867
- DOI: https://doi.org/10.22363/2658-4670-2021-29-2-114-125
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Abstract
Surface electromagnetic waves (Dyakonov waves) propagating along a plane interface between an isotropic substance with a constant dielectric constant and an anisotropic crystal, whose dielectric tensor has a symmetry axis directed along the interface, are considered. It is well known that the question of the existence of such surface waves is reduced to the question of the existence of a solution to a certain system of algebraic equations and inequalities. In the present work, this system is investigated in the Sage computer algebra system. The built-in technique of exceptional ideals in Sage made it possible to describe the solution of a system of algebraic equations parametrically using a single parameter, with all the original quantities expressed in terms of this parameter using radicals. The remaining inequalities were only partially investigated analytically. For a complete study of the solvability of the system of equations and inequalities, a symbolic-numerical algorithm is proposed and implemented in Sage, and the results of computer experiments are presented. Based on these results, conclusions were drawn that require further theoretical substantiation.
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1. Introduction In the 1980s, a special class of solutions to Maxwell’s equations was theoret- ically discovered, namely, electromagnetic waves traveling along the interface between two dielectrics, the intensity of which rapidly decreases with distance from the interface [1]-[6]. These waves are called Dyakonov surface waves. Experimental observation of surface waves was carried out quite recently [7], [8]. In theoretical works, as in the work of Dyakonov itself [2], the question of the existence of surface waves was reduced to the question of the existence of a solution to a certain system of algebraic equations and inequalities that cannot be solved analytically, which hinders further research. In this paper, it will be shown what computer algebra systems can give for these systems. 2. Surface waves We investigate the classical problem of waves propagating along the interface of an anisotropic medium with permittivity
About the authors
Oleg K. Kroytor
Peoples’ Friendship University of Russia (RUDN University)
Author for correspondence.
Email: kroytor_ok@pfur.ru
ORCID iD: 0000-0002-5691-7331
Postgraduate of Department of Applied Probability and Informatics
6, Miklukho-Maklaya St., Moscow, 117198, Russian FederationReferences
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