title: Complex relaxation rates of the Drude metals and their effects on the lifetime and symmetry of plasmon resonances.
abstract: The Drude model for metal is extended to include complex relaxation rates. As a test for what happens to the surface plasmon resonances with such metals, the lifetime is examined for propagating waves across a single planar metal-dielectric interface. By analytically solving the dispersion relation being fourth-order in the complex frequency, group-velocity dispersion and quality factors are explicitly found. Due to the symmetry breaking between the forward and backward waves, standing waves are not allowed in general.
authors.affiliation: Optics and Photonics Elite Research Academy, Inha University, Incheon 402-751, Korea. hileesam@naver.com
authors.forename: Hyoung-In
authors.initials: HI
authors.lastname: Lee
authors.forename: El-Hang
authors.initials: el-H
authors.lastname: Lee