2026-10-02T12:45:52Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/649422025-07-16T17:53:19Zcom_20.500.14352_14col_20.500.14352_15

Single-mode Anisotropic Cylindrical Dielectric Waveguides Fernández Álvarez-Estrada, Ramón Calvo Padilla, María Luisa We study anisotropic cylindrical dielectric waveguides under the following conditions: (1) their cross section Ω has arbitrary shape; (2) the dielectric permittivity tensor ε has discontinuities at the boundaries, as well as a graded spatial variation; (3) Ω is small, and ε minus the unit 3 × 3 matrix (I) is small and smooth, so that only one pair of propagation modes is allowed. A general and exact dispersion relation for the propagation modes is derived, using integral equation techniques and the long wavelength singularity of the free-space Green's function in two dimensions. We present approximate explicit solutions of the dispersion relation to first order in (ε− I), which exhibit a logarithmic dependence and birefringence, in general. Some numerical estimates are also given. Approximate dispersion relations up to and including second order in (ε − I) are also discussed. The scattering problem is treated briefly. 2023-06-21T02:08:04Z 2023-06-21T02:08:04Z 2023-06-21T02:08:04Z 1983 journal article https://hdl.handle.net/20.500.14352/64942 0030-3909 10.1080/713821213 metadata only access Taylor and Francis Ltd.