A multi-layered split ring metamaterial for a multiwavelength and tunable lasing spaser

• Main Authors: Yan, Changchun, Zhang, Dao Hua, Xu, Zhengji, Li, Dongdong, Yang, An
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/95845; http://hdl.handle.net/10220/11406
• Institution: Nanyang Technological University

We report a multiwavelength and tunable lasing spaser realized by a gain-assisted metamaterial. The metamaterial consists of three regularly spaced parallel arrays of weakly asymmetric metallic split rings, with the first-layered array located on the gain medium surface and the other two-layered arrays embedded in it. Our simulations demonstrate that the three-layered metamaterial can radiate three-wavelength electromagnetic waves with high Q factors and transmission enhancement, which can be tuned by varying the gain coefficient.