Finite element modelling of electromagnetic waves in doubly and triply periodic structures

The aim in paper titled "Finite element modelling of electromagnetic waves in doubly and triply periodic structures - IEE Proceedings in Optoelectronics, vol. 146, p. 111, 1999" was to apply the finite element method (FEM) to a 3-D triply periodic problem and demonstrate the FEM code/ formulation accuracy. Owing to computational constraints, the structure in Fig. 11 of this paper was chosen because of its computational convenience, not its properties. Thus, it was not our intention to analyse exhaustively the dispersion characteristics of the structure which may have a poor electromagnetic bandgap behaviour. Consequently, only two distinct eigenvalues were computed, one at a time.