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Sheets of slab waveguides with sharp corners are investigated. By means of rigorous numerical experiments, we look at oblique incidence of semiguided plane waves. Radiation losses vanish beyond a certain critical angle of incidence. One can thus realize lossless propagation through 90&#x00B0; corner configurations, where the remaining guided waves are still subject to pronounced reflection and polarization conversion. A system of two corners can be viewed as a structure akin to a Fabry-Perot interferometer. By adjusting the distance between the two partial reflectors, here the 90&#x00B0; corners, one identifies step-like configurations that transmit the semiguided plane waves without radiation losses, and virtually without reflections. Simulations of semiguided beams with in-plane wide Gaussian profiles show that the effect survives in a true 3-D framework.

Full Resonant Transmission of Semiguided Planar Waves Through Slab Waveguide Steps at Oblique Incidence