Propagation characteristics of the supermode based on two coupled semi-infinite rib plasmonic waveguides

Sheng Hsiung Chang, Tsen Chieh Chiu, Chao Yi Tai

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

We report on the propagation characteristics of a plasmonic waveguide structure based on two coupled rectangular wedges. Dispersion, propagation loss, and field distributions are investigated by three-dimensional finite-difference time-domain method. The considered structure supports only one supermode over 30THz bandwidth, and the calculated propagation loss at λ=1.55μm is 0.0257dB/μm, which is lower than the existing report by 1.7 times while keeping comparable field localizations. The all-planar structure in conjunction with the linearly dispersive characteristic over a wide operational bandwidth signifies its great potential for optical signal transporting in nanophotonic circuits.

Original languageEnglish
Pages (from-to)1755-1761
Number of pages7
JournalOptics Express
Volume15
Issue number4
DOIs
StatePublished - 19 Feb 2007

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