title: Deterministic relief dielectric structures to realize phase modulation of surface-plasmon polaritons.
abstract: We propose a modified effective-refractive-index model for the design of relief dielectric structures on a metal surface to realize phase modulation of surface-plasmon polaritons (SPPs). In this model, the length of the dielectric structure is optimized to reach phase shifting between the SPP waves transmitted through dielectric structure and those directly propagated with the consideration of SPP losses. Specifically, a one-dimensional dielectric Fresnel zone plate is designed by employing the proposed model to demonstrate phase modulation of SPPs for the highest focusing efficiency.
authors.affiliation: School of Electrical & Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798.
authors.forename: Q
authors.initials: Q
authors.lastname: Wang
authors.forename: J
authors.initials: J
authors.lastname: Bu
authors.forename: G H
authors.initials: GH
authors.lastname: Yuan
authors.forename: P S
authors.initials: PS
authors.lastname: Tan
authors.forename: J H
authors.initials: JH
authors.lastname: Teng
authors.forename: X-C
authors.initials: XC
authors.lastname: Yuan