Abstract

We design and investigate plasmon waveguides based on linear arrays of Au nanorings in an SiO<sub>2</sub> host for use in an optical communication band (λ ~ 1550 nm). Nanoring particles have better tunability and can achieve more laterally compact waveguides, compared to their solid counterparts, such as nanospheres and nanodisks. Three-dimensional simulations employing the finite-difference time-domain algorithm are used to determine the set of geometrical parameters attaining localized surface plasmon resonance at 1550 nm. It is found out that, in the SiO<sub>2</sub> host, Au nanorings attain LSPR at 1550 nm with a 175-nm inner diameter, a 35-nm height, and a 30-nm thickness. It is shown that linear chains of Au nanorings can transport the electromagnetic energy at 1550 nm, with transmission losses γ<i>T</i> = 3 dB/655 nm and γ<i>L</i> = 3 dB/443 nm and group velocities v<sub>gT</sub> = 0.177c<sub>0</sub> and v<sub>gL</sub> = 0.327c<sub>0</sub> for transverse and longitudinal polarizations, respectively, where c<sub>0</sub> is the speed of light in a vacuum.

© 2007 IEEE

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