Abstract
We numerically analyzed the power-coupling characteristics between a high-index-contrast dielectric slot waveguide and a metalinsulator- metal (MIM) plasmonic slot waveguide as functions of structural parameters. Couplings due mainly to the transfer of evanescent components in two waveguides generated high transmission efficiencies of 62% when the slot widths of the two waveguides were the same and 73% when the waveguides were optimized by slightly different widths. The maximum transmission efficiency in the slot-to-slot coupling was about 10% higher than that in the coupling between a normal slab waveguide and an MIM waveguide. Large alignment tolerance of the slot-to-slot coupling was also proved. Moreover, a small gap inserted into the interface between two waveguides effectively enhances the transmission efficiency, as in the case of couplings between a normal slab waveguide and an MIM waveguide. In addition, couplings with very wideband transmissions over a wavelength region of a few hundred nanometers were validated.
| Original language | English |
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| Pages (from-to) | 19082-19091 |
| Number of pages | 10 |
| Journal | Optics Express |
| Volume | 23 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - 2015 Jul 27 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics