3D interaction of Gaussian beams with dichroic surfaces for the modeling of quasi-optical systems

Kevin Elis (1, 2) , Alexandre Chabory (1) , Jérôme Sokoloff (3)

1 TELECOM - ENAC - Equipe télécommunications
2 CNES - Centre National d'Études Spatiales [Toulouse]
3 LAPLACE-GRE - Groupe de Recherche en Electromagnétisme

In quasi-optical systems, dichroic surfaces are used to split, filter, or mix signals. Such surfaces cannot be modeled by existing Gaussian-beam methods. In this article we propose a technique to model the interaction of a Gaussian beam (GB) with a dichroic surface based on a matching in the spectral domain. For a GB illumination of the surface, the reflected and transmitted fields are approximated by one reflected and one transmitted Gaussian beams. Their characteristics are determined by means of the spectral matching through a second-order approximation of the dichroic surface response when excited by plane-waves. Numerical experiments and comparisons with reference solutions show the efficiency of the method in terms of accuracy and computation time.

Mots clés: Gaussian beam; dichroic surface; spectrum matching; quasi-optics

Domaines: Sciences de l'ingénieur [physics]; Electromagnétisme

Kevin Elis, Alexandre Chabory, Jérôme Sokoloff. 3D interaction of Gaussian beams with dichroic surfaces for the modeling of quasi-optical systems. ANTEM 2012, 15th International Symposium of ANtenna Technology and applied ElectroMagnetics, Jun 2012, Toulouse, France. pp 1-5, ⟨10.1109/ANTEM.2012.6262371⟩. ⟨hal-01022308⟩