Plasmon resonance control using a defect region within a metal surfaceroughness

通过将我数值提出的一种模式控制方法应用于金属随机结构，我试图实现空间和光谱控制的等离子体激元模式作为一种新型的等离子体腔结构。从分析二维随机分布的金柱的数值方法中，我发现优化柱体的尺寸可以在缺陷处诱导出一个强烈的磁场强度斑点。然而，由于电场强度在相邻金柱的缝隙处表现出非常强烈的斑点，我得出结论，我们提出的方法不适合于目标模型结构，因为期望在缺陷处有很强的电场增强。此外，作为对所提方法的实验验证，我使用含有聚合物颗粒作为缺陷的均匀的氧化锌纳米颗粒薄膜进行了随机激光实验。从结果中，我发现随机激光的性质比传统的随机激光有了明显的改变，并成功地获得了表明该方法有效性的重要知识。

By applying a modal control method to metal random structures, which I have numerically proposed, I attempted to realize spatially- and spectrally-controlled plasmon modes as a novel plasmonic cavity structures. From numerical approach where I analyzed 2D randomly-distributed gold cylinders, I found that an intense spot of magnetic field intensity at a defect was induced by optimizing the cylinder sizes. However, as an electric field intensity exhibited extremely intense spots at the gaps of adjacent gold cylinders, I concluded that our proposed method was inappropriate to the targeted modeled structure for expecting strong electric field enhancement at the defect. In addition, as the experimental verification of our proposed method, I performed random laser experiments using a homogenized ZnO nanoparticle film including polymer particles as defects. From the results, I found that the random lasing properties were markedly modified from conventional random lasers and succeeded in getting important knowledge indicating the effectiveness of this method.