Structure of the core—cladding interface and radiation losses in hollow planar Bragg waveguides

A planar Bragg waveguide with a hollow core is considered. Analytic dependences of the mode properties of the waveguide on its geometrical parameters are presented. By using these dependences, optimal parameters of the Bragg waveguide are determined. The dependence of the properties of the waveguide modes on the structure of the internal boundary of its cladding is considered for the first time. In addition, the dependence of the waveguide radiation losses on the number of its layers is considered for wavelengths 1.55, 10.6 and 0.245 μm of practical interest.