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We have analyzed the linear propagation characteristics of planar periodic segmented waveguides with infinitely extended parabolic refractive-index segments in the transverse direction, using the matrix formulation of Gaussian beam propagation. Modal propagation and the variation of effective index as a function of duty cycle and the period of segmentation have been studied. Conditions for the existence of guided modes in such a segmented waveguide are presented.

Barium malate trihydrate crystals are grown by limited diffusion technique in hydro-silica gel. Relevant functional groups are identified from the FT-IR spectrum. Single crystal XRD shows that the crystal system is monoclinic with space group P2 1 /n. The optical band gap of the material, estimated using DRS, is 1.028 eV. The material exhibits a three stage thermal decomposition pattern.

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