Full resonant transmission of semi-guided planar waves through slab waveguide steps at oblique incidence

• Published in: arXiv.org
• Main Authors: Hammer, Manfred, Hildebrandt, Andre, stner, Jens
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 28.10.2015
• Subjects: Computer simulation; Configurations; Corners; Critical angle; Gaussian beams (optics); Incidence angle; Physics - Optics; Plane waves; Reflectors; Wave propagation; Waveguides
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1502.07619

Sheets of slab waveguides with sharp corners are investigated. By means of rigorous numerical experiments, we look at oblique incidence of semi-guided plane waves. Radiation losses vanish beyond a certain critical angle of incidence. One can thus realize lossless propagation through 90-degree 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-degree corners, one identifies step-like configurations that transmit the semi-guided plane waves without radiation losses, and virtually without reflections. Simulations of semi-guided beams with in-plane wide Gaussian profiles show that the effect survives in a true 3-D framework.