Strip-slot direct mode coupler

Kyunghun Han, Sangsik Kim, Justin Wirth, Min Teng, Yi Xuan, Ben Niu, Minghao Qi

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We present a direct strip-slot waveguide mode coupler without any auxiliary structures. Contrary to popular belief, an apparent mode mismatch between strip and slot waveguide does not deteriorate conversion efficiency. Separated electric and magnetic field distributions in a slot waveguide lead to highly efficient modal coupling in the direct strip-slot coupler and result in high conversion efficiency. Accurate experimental characterization shows that the direct strip-slot waveguide mode coupler is capable of up to 96% conversion efficiency with a broad bandwidth. Being simplest and of high efficiency, the direct strip-slot waveguide mode coupler can encourage potential applications of slot waveguides.

Original languageEnglish
Pages (from-to)6532-6541
Number of pages10
JournalOptics Express
Issue number6
StatePublished - Mar 21 2016


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