Institut Fresnel, UMR 6133, Université Aix-Marseille III, case 162, 13397 Marseille Cedex 20, France
Institut Fresnel, UMR 6133, Université Aix-Marseille I, case 162, 13397 Marseille Cedex 20, France
Blackett Laboratory, Imperial College London, London SW7 2EZ, UK
We present the modelling of twisted electromagnetic waveguides using helicoid coordinates. This amounts to introducing equivalent inhomogeneous anisotropic materials which are however taken into account easily by the finite element method. An interesting property of such helicoid coordinates is to preserve the intrinsically two-dimensional nature of the problem.
(Received December 1 2003)
(Revised June 28 2004)
(Accepted August 4 2004)
(Online publication November 3 2004)