title: Self-collimation phenomena of surface waves in structured perfect electric conductors and metal surfaces.
abstract: We demonstrate that surface waves in structured perfect electric conductor surfaces can be self-collimated using the finite-difference time-domain method. The self-collimation frequency is obtained from the equi-frequency contours of a perfect electric conductor patterned with an array of square holes. The field patterns of the self-collimated surface wave, obtained using the periodic boundary conditions, show that the surface waves propagate with almost no spreading. We also show that self-collimation phenomena can be observed for the hybrid surface plasmon waves in structured metal surfaces using the finite-difference time-domain method with the Drude model. It is shown that for a structured silver surface the self-collimation can be achieved at the frequencies in the infrared region.
authors.forename: Sang Soon
authors.initials: SS
authors.lastname: Oh
authors.forename: Sun-Goo
authors.initials: SG
authors.lastname: Lee
authors.forename: Jae-Eun
authors.initials: JE
authors.lastname: Kim
authors.forename: Hae Yong
authors.initials: HY
authors.lastname: Park