%0 Journal Article
%T Reciprocity and the scattering matrix of waveguide modes
%A Guro K. Svendsen
%A Magnus W. Haakestad
%A Johannes Skaar
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevA.87.013838
%X The implications of the Lorentz reciprocity theorem for a scatterer connected to waveguides with arbitrary modes, including degenerate, evanescent, and complex modes, are discussed. In general it turns out that a matrix $CS$ is symmetric, where $C$ is the matrix of generalized orthogonality coefficients, and $S$ is the scattering matrix. Examples are given, including a scatterer surrounded by waveguides or free space, and discontinuities of waveguides.
%U http://arxiv.org/abs/1301.2458v1