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Direct simulation of material permittivities by using an eigen-susceptibility formulation of the vector variational approach

This paper presents a new method for the extraction of material parameters, in this case the permittivity, by formulating the Maxwell equations as an eigen-susceptibility problem of the considered sample. This offers a direct solution of the desired material parameters by utilizing adequate and well proven numerical techniques. Hence, it is very useful if analytical approaches do not provide the aimed accuracy or even fail completely. The procedure will be demonstrated by applying the variational approach to a triple mode cavity perturbation method for the characterization of the complex permittivity tensor of general biaxial anisotropic media.