The enhanced random lasing from dye-doped polymer films with different-sized silver nanoparticles
The enhanced random lasing from dye-doped polymer films with different-sized silver nanoparticles
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不同尺寸银纳米粒子的染料掺杂聚合物薄膜的增强随机激光发射
DOI：
10.1016/j.orgel.2015.12.021
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发表时间：
2016-03-01
影响因子：
3.2
通讯作者：
Zhang, Fanghui
中科院分区：
文献类型：
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作者：
Ning, Shuya;Wu, Zhaoxin;Zhang, Fanghui
我们报道了掺杂银纳米颗粒（Ag NP）的有机染料增强的随机激光发射，Ag NP 的尺寸范围为 8 nm 至 250 nm。研究了不同尺寸的银纳米粒子对激光性能的影响。我们发现随机激光特性对 Ag NP 的尺寸有很强的依赖性，并且通过引入直径为 150 nm 的 Ag NP 实现了最低阈值。通过实验和米氏理论研究局域表面等离子体共振引起的局域电磁场增强以及Ag NPs的散射效应，我们发现局域电磁场增强对小Ag NPs（直径<50 nm）的有机染料激光增强起主要作用；散射效应是大银纳米颗粒（直径 >= 100 nm）随机激光产生的主要机制，这也表明最低阈值和最强激光由光子散射主导。 (C) 2015 Elsevier B.V. 保留所有权利。
We reported on the enhanced random lasing from organic dyes doped with silver nanoparticles (Ag NPs), the sizes of Ag NPs ranged from 8 nm to 250 nm. The effects of different sizes of Ag NPs on the lasing properties were studied. We found a strong dependence of the random lasing properties on the size of the Ag NPs, and the lowest threshold was achieved by the introduction of Ag NPs with the diameter of 150 nm. By studying the enhanced localized electromagnetic (EM) field due to localized surface-plasmon resonance and the scattering effect of Ag NPs in experiment and Mie theory, we found that the enhanced localized EM field plays a major role on enhanced lasing of organic dyes for the small Ag NPs (diameter < 50 nm); and the scattering effect is the dominant underlying mechanism for random lasing for the large Ag NPs (diameter >= 100 nm), which also suggest that the lowest threshold and strongest lasing are dominated by the photon scattering. (C) 2015 Elsevier B.V. All rights reserved.