Abstract
A numerical analysis of periodic segmented waveguides (PSWs) using the
2-D finite element method (2D-FEM) in the frequency domain is presented.
This method has significantly lower computational cost when compared with
3-D methods that have been used to model PSWs, and can also model back reflected
signals. Unlike photonic crystal waveguides, light confinement in a PSW is
due to total internal reflection as in a continuous waveguide (CWG). We show
that the dispersion relation of the guided modes in PSW is strongly influenced
by the dielectric periodicity along the waveguide. We calculate the mode
profile of a PSW in a region far away from the bandgap and we showed that
it is comparable to the mode profile of the equivalent CWG even for relatively
high values of averaged refractive index contrast.
© 2014 IEEE
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