Figure 6
Crosstalk reduction for silicon slot waveguides. (a) Sketch of the proposed configuration consisting of a periodic silicon strip array inserted in between the silicon slot waveguide pair; (b) Ex field distributions of the symmetric and anti-symmetric super-TE-modes in a typical coupling system enabling the optimal coupling length; (c) effect of strip width on the coupling length for configurations with and without the three-strip array (SA). Parameters are w 1 = 250 nm, w 2 = 50 nm, h = 220 nm, S = 500 nm. The widths of the strip and the air gap at the maximum coupling length are w s = 88 nm and w s = 59 nm, respectively. The field profiles illustrate relatively weak modal overlap between neighboring structures at the optimal coupling length.
