Polarization properties of two-dimensional slot waveguides

Amit Khanna, Antti Säynätjoki, Ari Tervonen, Robert A. Norwood, Seppo Honkanen

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We propose and study slot waveguide geometries where both quasi-TE and quasi-TM modes may propagate highly confined within the same low-index slot region. Conventional horizontal and vertical slot waveguides can only provide high slot confinement for either the quasi-TM or quasi-TE modes, respectively. Different two-dimensional slot waveguide structures are analyzed in terms of their mode characteristics, such as the effective index, the confinement factor, and the overlap of quasi-TE and -TM modes within the slot. Attention is also paid to practical manufacturability. Various waveguide structures can be tailored to have zero birefringence or equal confinement at both polarizations. Values for the confinement factors and the overlap of the two polarizations, in the slot region, can reach 0.4 to 0.5.

Original languageEnglish (US)
Pages (from-to)5321-5332
Number of pages12
JournalApplied optics
Issue number28
StatePublished - Oct 1 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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