Surface and leaky waves of a planar dielectric waveguide with a diffraction grating.

The eigenwave propagation problem is solved for a periodic waveguide composed of a planar dielectric waveguide and a reflecting diffraction grating. The technique the authors used is the spectral theory of open waveguide structures. The numerical data for the dependences of the propagation constants of surface and complex (leaky) eigenwaves are presented versus frequency and geometrical parameters of the periodic waveguide. In the frequency range of leaky eigenwaves, the angular-frequency characteristics of the radiation directivity are experimentally studied. The experimental results demonstrate the feasibility of the proposed approach. [ABSTRACT FROM AUTHOR]