Evaluation of slot-to-slot coupling between dielectric slot waveguides and metal-insulatormetal slot waveguides

Deqing Kong, Makoto Tsubokawa

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6 Citations (Scopus)

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 languageEnglish
Pages (from-to)19082-19091
Number of pages10
JournalOptics Express
Volume23
Issue number15
DOIs
Publication statusPublished - 2015 Jul 27

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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