一、题 目：Reducing the Losses of Optical Metamaterials
二、报告人：Dr. Fan, Anan （Iowa State University）
Metamaterials have attracted much attention due to its unprecedented electromagnetic properties. However, the envisioned applications are limited by the huge internal losses in the optical regime. Incorporation of gain into the metamaterial nanostructure becomes the most promising and generic way to reduce the losses. We present a computational scheme allowing for the self-consistent treatment of the combined system of metamaterial and gain. The gain is described by a semi-classical 4-level atomic system. Studies on different metamaterial structures, such as SRRs and fishnet structures, show low loss metamaterials are achievable by the introduction of gain.