%0 Journal Article %J OPTICS EXPRESS %D 2009 %T Hybrid long-range surface plasmon-polariton modes with tight field confinement guided by asymmetrical waveguides %A Chen, Jianjun %A Li, Zhi %A Yue, Song %A Qihuang Gong %X A finite width dielectric-metal-dielectric (DMD) waveguide placed on a substrate is numerically investigated near the telecom wavelength lambda = 1550 nm by the finite element method. With proper waveguide sizes, the asymmetrical DMD waveguide can support hybrid long-range surface plasmon-polariton modes which have tight field confinement (similar to 700 nm) and long propagation lengths (L> 300 mu m) simultaneously. Compact plasmonic waveguide-ring resonators (WRRs) based on such asymmetrical DMD waveguide show high quality factors compared with dielectric-loaded surface plasmon-polariton, channel plasmon polariton, plasmonic whispering-gallery microcavity, and pure dielectric waveguide cases. (C) 2009 Optical Society of America %B OPTICS EXPRESS %I OPTICAL SOC AMER %C 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA %V 17 %P 23603-23609 %8 DEC 21 %G eng %9 Article %] 000273156200027 %R 10.1364/OE.17.023603