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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Assessing the Location of Surface Plasmons Over Nanotriangle and Nanohoie Arrays of Different Size and Periodicity
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Assessing the Location of Surface Plasmons Over Nanotriangle and Nanohoie Arrays of Different Size and Periodicity

机译：评估表面等离子体在不同大小和周期性的纳米三角形和纳米阵列上的位置

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The increasing popularity of surface plasmon resonance (SPR) and surface enhanced Raman scattering (SERS) sensor design based on nanotriangle or nanohoie arrays, and the possibility to manufacture substrates at the transition between these plasmonic substrates, makes them ideal candidates for the establishment of structure—property relationships. This work features near diffraction-limited Raman images and finite-difference time-domain (FDTD) simulations of nanotriangle and nanohoie array substrates, which clearly demonstrate that the localization of the hot spot on these SERS substrates is significantly influenced by the ratio of diameter/periodicity (D/P). The experimental and simulation data reveal that the hot spots are located around nanotriangles (D/P = l), characteristic of localized SPR. Decreasing the D/P ratio to 0.75—0.7 led to the creation of nanohoie arrays, which promoted the excitation of a propagating surface plasmon (SP) delocalized over the metal network. The optimal SERS intensity was consistently achieved at this transition from nanotriangles to nanoholes, for every periodicity (650 nm to 1.5 /*m) and excitation wavelength (633 and 785 nm) investigated, despite the presence or absence of a plasmonic band near the laser excitation. Further decreasing the D/P ratio led to excitation of a localized SP located around the rim of nanohoie arrays for D/P of 0.5—0.6, in agreement with previous reports. In addition, this manuscript provides the first evidence that the hot spots are positioned inside the hole for D/P of 0.4, with the center being the region of highest electric field and Raman intensity. The compelling experimental evidence and FDTD simulations offer an overall understanding of the plasmonic properties of nanohoie arrays as SERS and SPR sensors, which is of significant value in advancing the diversity of applications from such surfaces.
机译：基于纳米三角形或纳米光栅阵列的表面等离子体激元共振（SPR）和表面增强拉曼散射（SERS）传感器设计的日益普及，以及在这些等离子体激元衬底之间过渡时制造衬底的可能性，使其成为建立结构的理想候选者—财产关系。这项工作具有近衍射极限拉曼图像和纳米三角形和纳米膜阵列基板的有限差分时域（FDTD）模拟功能，这清楚地表明，热点在这些SERS基板上的位置受到直径/直径比的显着影响。周期性（D / P）。实验和模拟数据表明，热点位于纳米三角形（D / P = 1）周围，这是局部SPR的特征。将D / P比降低到0.75-0.7导致了纳米级阵列的创建，从而促进了在金属网络上散布的传播表面等离激元（SP）的激发。尽管在激光器附近存在或不存在等离子体激元，但对于从每个三角形（650 nm至1.5 / * m）和激发波长（633和785 nm）的这种从纳米三角形到纳米孔的过渡，始终都能实现最佳SERS强度。励磁。与先前的报道一致，进一步降低D / P比会导致激发纳米粒子阵列边缘周围的局部SP，D / P为0.5-0.6。另外，该手稿提供了第一个证据，证明热点位于孔内，D / P为0.4，中心是最高电场和拉曼强度的区域。引人注目的实验证据和FDTD模拟提供了对作为SERS和SPR传感器的纳米级阵列的等离子特性的全面了解，这对于推进此类表面的应用多样性具有重要价值。

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