Abstract
We investigate a short (~1.5 μm) “partially” corrugated tapered
waveguide for silicon-based micro-slab waveguide to plasmonic nano-gap waveguide mode
conversion at the optical communication frequency. The structure is designed to achieve
more precise mode matching between the silicon slabs and plasmonic wave guides. High
transmission efficiencies up to 87% ~ 98% have been demonstrated numerically. The
results show that the corrugated structure should not only be helpful for realizing full
on-chip silicon plasmonic devices but also a good choice for mode coupling enhancement
from dielectric wave guides to plasmonic wave guides. Meanwhile, we point out that the
coupling mechanism reported here is different from that achieved by exciting surface
plasmon polaritions (SPPs) at metal surfaces reported in the literature
[18],[19].
© 2013 IEEE
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