Polarization rotation and coupling between silicon waveguide and hybrid plasmonic waveguide

Sangsik Kim, Minghao Qi

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

We present a polarization rotation and coupling scheme that rotates a TE0 mode in a silicon waveguide and simultaneously couples the rotated mode to a hybrid plasmonic (HP0) waveguide mode. Such a polarization rotation can be realized with a partially etched asymmetric hybrid plasmonic waveguide consisting of a silicon strip waveguide, a thin oxide spacer, and a metal cap made from copper, gold, silver or aluminum. Two implementations, one with and one without the tapering of the metal cap are presented, and different taper shapes (linear and exponential) are also analyzed. The devices have large 3 dB conversion bandwidths (over 200 nm at near infrared) and short length (<5 μ m), and achieve a maximum coupling factor of ∼78% with a linearly tapered silver metal cap.

Original languageEnglish
Pages (from-to)9968-9978
Number of pages11
JournalOptics Express
Volume23
Issue number8
DOIs
StatePublished - 2015

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