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- W2288455890 abstract "Semi-guided light propagation across linear folds of slab waveguides is being considered. Radiation losses vanish beyond certain critical angles of incidence, as can be understood by arguments resembling Snell's law. One thus realizes lossless propagation through 90-degree corner configurations, where the remaining guided waves are still subject to pronounced reflection and polarization conversion. A step-like system of two of these sharp corners can then be viewed as a system akin to a Fabry-Perot interferometer, with two partial reflectors at a distance given by the vertical separation of the slab cores. The respective resonance effect enables full transmission of semiguided, laterally plane waves through the step structures. One obtains a configuration that optically connects guiding layers at different elevation levels in a 3-D integrated optical chip, without radiation losses, over large distances, and reasonably broadband. We show rigorous quasi-analytical results for typical high-contrast Si/SiO2 structures. Although the full-transmission effect requires a symmetric system, here realized by slab waveguides with a silicon core sandwiched between thick silica substrate and cover layers, simulations for configurations with air cover show that a certain asymmetry can well be afforded." @default.
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- W2288455890 date "2016-03-01" @default.
- W2288455890 modified "2023-10-03" @default.
- W2288455890 title "Oblique incidence of semi-guided waves on step-like folds in planar dielectric slabs: Lossless vertical interconnects in 3D integrated photonic circuits" @default.
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- W2288455890 doi "https://doi.org/10.1117/12.2214460" @default.
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