Plasmon Wave Propagation Property of Metal Wedge Plasmonic Waveguides Covered by a Protective Oxide Layer

Guiding plasmon waves is based on dielectric/metal interfaces. The wedge-shaped interface shows an excellent capacity in the tight lightwave confinement at deep-subwavelength propagation mode size. Several types of metals have also been investigated for guiding waves. Among them, Ag metal a wave ability superior to other metals, however, it sensitive operating medium and easily oxidized. To overcome these drawbacks, wedge covered by protective thin oxide layer proposed. Numerically results show that length silicon dioxide can be enhanced factor 7.5 while its figure merit least 1.7 times larger than Au waveguide. advantage proposed potential developing plasmonic waveguide components.