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Nanoscale hybrid plasmonic waveguide. (a) The schematic of the plasmonic waveguide and its light in-coupling scheme. The inset is the cross section of the waveguide, showing the underlying layers. (b) The SEM image of a typical hybrid plasmonic waveguide.
Hybrid plasmonic waveguide mode. (a) The calculated electric field distribution at the wavelength, . Most of the energy is concentrated in the silica insulator layer. The diameter of the Si nanowire is 170 nm, thickness is 13 nm, and Ag thickness is 70 nm. (Ref. 29), , and (Ref. 30) at the wavelength 980 nm. (b) Normalized energy density along the vertical dashed line in . . is the electromagnetic energy distribution, and is the total electromagnetic energy, respectively. The upper and bottom shaded areas represent silicon and silver regions, respectively.
Hybrid plasmonic mode propagation in different waveguides. (a) SEM image of a long nanowire (170 nm in diameter). (b) Optical microscope image illustrating the experimental excitation of the plasmonic mode in the waveguide.
A hybrid plasmonic waveguide coupler. (a) SEM image of the coupler. The length of the lower waveguide is and the diameter is 180 nm. The parameters are and 190 nm for the upper waveguide. The overlapping part between two wires has a length of about . Inset is the enlarged SEM image of the coupling area. (b) The dark field optical microscope image illustrates the propagation of light along the nanowire coupler. (c) Light density profile along the nanowire (white line direction) in (b). The dashed line is a fit of the data to an exponentially decaying function.
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