Theory of Pump-Probe Experiments of Metallic Metamaterials Coupled to a Gain Medium

被引：51

作者：

Huang, Zhixiang ^{[1
,2
,3
]}

Koschny, Th. ^{[1
,2
]}

Soukoulis, C. M. ^{[1
,2
,4
]}

机构：

[1] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[3] Anhui Univ, Key Lab Intelligent Comp & Signal Proc, Hefei 230039, Peoples R China

[4] FORTH, Inst Elect Struct & Laser, Iraklion 71110, Crete, Greece

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 18期

基金：

中国国家自然科学基金;

关键词：

NEGATIVE-INDEX METAMATERIALS;

D O I：

10.1103/PhysRevLett.108.187402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We establish a new approach for pump-probe simulations of metallic metamaterials coupled to the gain materials. It is of vital importance to understand the mechanism of the coupling of metamaterials with the gain medium. Using a four-level gain system, we have studied light amplification of arrays of metallic split-ring resonators with a gain layer underneath. We find that the differential transmittance Delta T/T can be negative for split-ring resonators on the top of the gain substrate, which is not expected, and Delta T/T is positive for the gain substrate alone. These simulations agree with pump-probe experiments and can help to design new experiments to compensate for the losses of metamaterials.

引用

页数：5