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Nanoplasmonic power splitters based on the horizontal nanoplasmonic slot waveguide
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Image of FIG. 1.
FIG. 1.

(Color online) (a) Optical microscope picture of a nanoplasmonic splitter inserted in Si wire waveguides; (b) schematic cross-section of horizontal Cu/SiO2/Si/SiO2/Cu nanoplasmonic slot waveguide; (c) layout; (d) SEM image of the Si core; (e) normalized magnetic field (Hy) distribution at the middle of Si core height obtained from the 3D FDTD simulation for 60° Y-splitter; (f), (g), and (h) the corresponding pictures for 120° splitter; (i), (j), and (k) the corresponding pictures for 180° splitter (T-splitter); (l), (m), and (n) the corresponding pictures for 1 × 3 cross-splitter. The parameters are designed as LC = 0.5 μm, LP = 3 μm, WP = 180 nm, and WSi = 500 nm.

Image of FIG. 2.
FIG. 2.

(Color online) (a) The cross-sectional transmission electron microscopy of fabricated horizontal Cu/SiO2/Si/SiO2/Cu nanoplasmonic slot waveguide; (b) the normalized output power measured from six sets of straight nanoplasmonic waveguides (indicated by different colors) at TE 1550 nm, from which the propagation loss and the coupling loss to the Si wire waveguide are extracted using the cut-back method.

Image of FIG. 3.
FIG. 3.

(Color online) The normalized output power spectra measured at output ports of 60°, 120°, 180° Y-splitter and 1 × 3 cross-splitter for wavelengths ranging from 1520 to 1620 nm. The insets are corresponding infrared pictures taken at the output side of the chip.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Excess loss obtained from 2D FDTD simulation for nanoplasmonic Y-splitters with 47-nm and 100-nm Si core surrounded by 26-nm SiO2 as a function of the opening angle, the inset shows one example of Hy distribution in the splitter launched by 1550-nm TE light; (b) the Hy distribution obtained from 3D FDTD simulation for the T-splitter with broadened junction; (c) the Hy distribution for the cross-splitter with broadened junction, the Si core at the junction center is extended to 0.3 μm whereas the other parameters keep the same, the percentage power delivered to each branch is also indicated.


Generic image for table
Table I.

Experimental and theoretical normalized output powers at each output port of nanoplasmonic splitters.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanoplasmonic power splitters based on the horizontal nanoplasmonic slot waveguide