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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Optimizing Gold Nanoparticle Cluster Configurations (n 7) for Array Applications
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Optimizing Gold Nanoparticle Cluster Configurations (n 7) for Array Applications

机译：针对阵列应用优化金纳米颗粒簇构型（n <7）

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摘要

Nanoparticle cluster arrays (NCAs) are novel electromagnetic materials whose properties depend on the size and shape of the constituent nanoparticle clusters. A rational design of NCAs with defined optical properties requires a thorough understanding of the geometry-dependent optical response of the building blocks. Herein, we systematically investigate the near- and far-field responses of clusters of closely packed 60 nm gold nanoparticles (n≤ 7) as a function of size and cluster geometry through a combination of experimental spectroscopy and generalized Mie theory calculations. From all of the investigated cluster configurations, nanoparticle trimers with D_(3h) geometry and heptamers in D_(6h) geometry stand out due to their polarization-insensitive responses and high electric (E) field intensity enhancements, making them building blocks of choice in this size range. The near-field intensity maximum of the D_(6h) heptamer is red-shifted with regard to the D_(3h) trimer by 125 nm, which confirms the possibility of a rational tuning of the near-field response in NCAs through the choice of the constituent nanoparticle clusters. For the nanoparticle trimer we investigate the influence of the cluster geometry on the optical response in detail and map near- and far-field spectra associated with the transition of the cluster configuration from D_(3h), into D_(∞h).
机译：纳米粒子簇阵列（NCA）是新型电磁材料，其性能取决于组成的纳米粒子簇的大小和形状。具有定义的光学属性的NCA的合理设计需要对构件的几何相关光学响应有透彻的了解。在本文中，我们通过结合实验光谱学和广义Mie理论计算，系统地研究了紧密堆积的60 nm金纳米颗粒（n≤7）的簇的近场和远场响应随尺寸和簇几何形状的变化。在所有研究的簇构型中，具有D_（3h）几何形状的纳米三聚体和D_（6h）几何形状的七聚体因其对极化不敏感的响应和高电场（E）场强增强而脱颖而出，使其成为选择的构建基块。这个尺寸范围。 D_（6h）七聚体的近场强度最大值相对于D_（3h）三聚体发生了红移125 nm，这确认了通过选择以下项可以合理调整NCA中的近场响应的可能性。组成的纳米粒子簇。对于纳米粒子三聚物，我们详细研究了团簇几何形状对光学响应的​​影响，并绘制了与团簇构型从D_（3h）转变为D_（∞h）相关的近场和远场光谱。

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