The Ag dielectric function in plasmonic metamaterials

V. P. Drachev, Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University
Uday K. Chettiar, Purdue University
Alexander V. Kildishev, Birck Nanotechnology Center, Purdue University
Hsiao-Kuan Yuan, Purdue University - Main Campus
Wenshan Cai, Purdue University - Main Campus
V. M. Shalaev, Birck Nanotechnology Center and School of Electrical and Computer Engineering, Purdue University

Abstract

Ag permittivity (dielectric function) in coupled strips is different from bulk and has been studied for strips of various dimensions and surface roughness. Arrays of such paired strips exhibit the properties of metamagnetics. The surface roughness does not affect the Ag dielectric function, although it does increase the loss at the plasmon resonances of the coupled strips. The size effect in the imaginary part of the dielectric function is significant for both polarizations of light, parallel and perpendicular to the strips with relatively large A-parameter.