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(a) Schematic diagram of a VDC with two vertically stacked metal stripes. (b) An optical microscope image of the fabricated VDCs. The inset shows a magnification of the stacked metal stripes.
(a) Electric-field distributions of the even and odd modes supported by two parallel, vertically coupled metal stripes. The brighter is larger in field amplitude. (b) Attenuation constants of the two modes. The inset shows effective indices .
Measured channel outputs of the VDCs with various interaction lengths. (a) Normalized optical powers of the two output channels. Solid curves are functions fitted to the measured data (small squares and circles). (b) IR images of the channel outputs when (top) and (bottom).
Comparison on attenuation constants of VDCs (solid curves) and LDCs (dashed curves). The inset shows coupling lengths for completely transferring output power from one channel to the other.
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