Lasing in metamaterial nanostructures
Lasing in metamaterial nanostructures
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DOI：
10.1088/2040-8978/12/2/024013
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发表时间：
2010-02-01
影响因子：
2.1
通讯作者：
Soukoulis, Costas M.
中科院分区：
文献类型：
--
作者：
Fang, Anan;Koschny, Thomas;Soukoulis, Costas M.
提出了一种适用于一维（1D）和二维（2D）超材料系统的自洽计算方案，其中增益被并入纳米结构中。增益由一个通用的四电平系统描述。研究了具有增益的异向介质系统的损耗补偿和激射特性。存在一个临界抽运率用于补偿超材料的损耗。存在宽范围的输入信号，其中复合系统表现为线性。由于增益耗尽，对于较强的信号出现非线性。给出了两层Lorentz介质棒和开口环谐振器（SRR）中嵌入一层增益的有效参数的反演结果，其中包含两种不同的增益：（1）增益仅嵌入间隙中，（2）增益围绕SRR。当泵送速率增加时，存在超材料系统开始发射激光的临界泵送速率。
A self-consistent computational scheme is presented for one-dimensional (1D) and two-dimensional (2D) metamaterial systems with gain incorporated into the nanostructures. The gain is described by a generic four-level system. The loss compensation and the lasing behavior of the metamaterial system with gain are studied. A critical pumping rate exists for compensating the losses of the metamaterial. There exists a wide range of input signals where the composite system behaves linearly. Nonlinearities arise for stronger signals due to gain depletion. The retrieved effective parameters are presented for one layer of gain embedded in two layers of Lorentz dielectric rods and split ring resonators (SRR) with two different gain inclusions: (1) gain is embedded in the gaps only and (2) gain is surrounding the SRR. When the pumping rate increases, there is a critical pumping rate at which the metamaterial system starts lasing.