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(a) Schematic illustration of the HDLPW. (b) Effective index and propagation length as functions of the thickness of the -stripe for different Si-nanowire thicknesses. (c) field profile and mode characteristics in the HDLPW with , , and . (d) The percentage of optical power and the average optical intensity confined in the -stripe as functions of the thickness of the -stripe for different Si-nanowire thicknesses. All simulations were performed at a wavelength of .
(a) Power transmitted by the 90°-circular waveguide bend as a function of the bend radius . (b) Power transmission through a S-shaped waveguide bend with a lateral distance of as a function of the length . The inset shows the three-dimensional free views of the simulated structure and near-field distributions for (a) radius and (b) bend length .
(a) Schematics of the proposed HDLPW-based directional coupler. (b) Dependence of the coupling length and maximum transmitted power on the separation distance between two parallel HDLPWs. (c) Near-field distribution at the center of the -strip for the case , corresponding to a coupling length and maximum power transfer of 91%.
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