Statistics of Randomized Plasmonic Lattice Lasers
Statistics of Randomized Plasmonic Lattice Lasers
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DOI：
10.1021/acsphotonics.5b00226
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发表时间：
2015-09-01
期刊：
影响因子：
7
通讯作者：
Koenderink, A. Femius
中科院分区：
文献类型：
--
作者：
Schokker, A. Hinke;Koenderink, A. Femius
研究了染料掺杂波导中银粒子随机晶格的激光发射。我们开始回答一个基本问题，由早期在2D周期性等离子体粒子晶格中观察到的分布反馈激光引发：你需要多少阶才能获得激光？我们从银纳米颗粒的衍射2D正方形晶格开始，其间距在染料的发射波长处满足二阶布拉格衍射条件。通过随机移除粒子和置换粒子，我们增加了无序。我们观察到，在二阶布拉格衍射条件下的激光是非常强大的，激光甚至持续99%的粒子被删除时。在一定数量的无序之上，由于随机激射，在光谱中以及在傅立叶图像中出现新的特征。我们分类傅立叶空间输出的基础上的结构因子计算。此外，我们将散斑强度统计分析应用于实空间荧光图像，并提出了一种区分自发辐射和激光辐射的新方法。
We study lasing in randomized lattices of silver particles in a dye-doped waveguide. We set out to answer a basic question, triggered by earlier observations of distributed feedback lasing in 2D periodic plasmonic particle lattices: how much order do you need to obtain lasing? We start from a diffractive 2D square lattice of silver nanoparticles with a pitch that satisfies the second-order Bragg diffraction condition at the emission wavelength of the dye. By randomly removing particles and by displacing particles we increase disorder. We observe that lasing at the second-order Bragg diffraction condition is very robust, with lasing even persisting when 99% of particles are removed. Above a certain amount of disorder new features appear in the spectrum as well as in the Fourier image that are due to random lasing. We classify Fourier space output on the basis of structure factor calculations. In addition we apply speckle intensity statistics analysis to real-space fluorescence images and introduce a new method to differentiate between spontaneous emission and lasing emission.