Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 36, Issue 9, Pages 2395-2401Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.36.002395
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- Deutsche Forschungsgemeinschaft [231447078-TRR 142, HA 7314/1-1]
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Radiation losses at a junction of high-contrast Si/SiO2 slabs of different thicknesses can be avoided, if, for excitation by semi-guided waves, the angle of incidence is raised beyond a critical angle. By introducing an additional short waveguide segment of intermediate thickness at the junction, reflections can be suppressed; our simulations predict near-full transmittance for the thus coated interface. These are nonresonant effects; the structures perform adequately for incidence of semi-guided Gaussian beams of moderate widths, and for a comparatively broad wavelength range. (C) 2019 Optical Society of America
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