Highly efficient coupler for dielectric slot waveguides and hybrid plasmonic waveguides

Jiyao Yu, Yasuo Ohtera, Hirohito Yamada

Research output: Contribution to journalArticlepeer-review

Abstract

A compact, highly efficient optical coupler for dielectric slot waveguides and hybrid plasmonic waveguides based on transition layers (air slot grooves) was investigated. The power-coupling efficiency of 75% for the direct coupling case increased to 90% following the insertion of an intermediate section. By performing time-averaged Poynting vector analysis, we successfully separated the factors of transmission, reflection, and radiation at the coupler interface. We found that the insertion of optimal air grooves into the coupler structure contributed to the improvement of coupling performance. The proposed compact structure is characterized by a high transmission efficiency, low reflection, small length, and broadband spectrum response.

Original languageEnglish
Article number052202
JournalJapanese journal of applied physics
Volume57
Issue number5
DOIs
Publication statusPublished - 2018 May

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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