期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 34, 期 3, 页码 997-1005出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2015.2502431
关键词
Integrated optics; numerical/analyticalmodeling; slab waveguide discontinuities; thin-film transitions; vertical couplers; 90 degrees waveguide corners
资金
- German Research Foundation (Deutsche Forschungsgemeinschaft DFG) [HA 7314/1-1, GRK 1464, TRR 142]
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. 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. 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.
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