Advanced Technology Institute and Department of Physics, University of Surrey, Guildford, GU27XH Surrey, United Kingdom.
Phys Rev Lett. 2010 Sep 17;105(12):127401. doi: 10.1103/PhysRevLett.105.127401. Epub 2010 Sep 14.
On the basis of a full-vectorial three-dimensional Maxwell-Bloch approach we investigate the possibility of using gain to overcome losses in a negative refractive index fishnet metamaterial. We show that appropriate placing of optically pumped laser dyes (gain) into the metamaterial structure results in a frequency band where the nonbianisotropic metamaterial becomes amplifying. In that region both the real and the imaginary part of the effective refractive index become simultaneously negative and the figure of merit diverges at two distinct frequency points.
基于全矢量三维 Maxwell-Bloch 方法，我们研究了在负折射率鱼网超材料中使用增益来克服损耗的可能性。我们表明，将光学泵浦激光染料（增益）适当放置在超材料结构中，会导致非双各向异性超材料在一个频带内变成放大状态。在该区域，有效折射率的实部和虚部同时变为负值，且品质因数在两个不同的频率点发散。
