We report our results on a plasmonic random laser with three-dimensional (3D) gold nano-urchins as scatterers distributed in rhodamine 6G dye-doped polymer film. The performance of anisotropic urchin scatterers is first studied using electromagnetic simulations for absorption/scattering cross-section and local field enhancement. This is compared to gold nanospheres of similar size. The simulation results indicate a two-fold local field enhancement, a higher scattering cross-section, and a low absorption cross-section in the 400 nm–570 nm spectral region of interest for nano-urchins. The effective scattering mean free path for urchins is calculated to be 90 µ m less than nanoparticles. This suggests nano-urchins are efficient scatterers over conventional nanospheres for random lasing. A random laser is then experimentally demonstrated using gold nano-urchin scatterers, and incoherent lasing emission is observed for very low urchin number density of order ∼10 8 cm<...

中文翻译：

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纳米金顽童，用于等离子体增强染料掺杂聚合物中的随机激射

我们在三维（3D）金纳米顽皮作为散射体分布在若丹明6G染料掺杂的聚合物薄膜中的等离激元随机激光上报告了我们的结果。首先使用电磁模拟研究各向异性海胆散射体的性能，以吸收/散射横截面并增强局部场。将其与相似大小的金纳米球进行比较。模拟结果表明，在纳米海胆所关注的400 nm–570 nm光谱区域中，局部场增强了两倍，散射截面更高，吸收截面更低。海胆的有效散射平均自由程经计算比纳米颗粒小90 µm。这表明，对于常规的激光发射，纳米顽皮是传统纳米球的有效散射体。