Assessing the Location of Surface Plasmons Over Nanotriangle and Nanohole Arrays of Different Size and Periodicity.
Assessing the Location of Surface Plasmons Over Nanotriangle and Nanohole Arrays of Different Size and Periodicity.
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DOI：
10.1021/jp3009018
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发表时间：
2012-03-29
影响因子：
3.7
通讯作者：
Masson, Jean-Francois
中科院分区：
文献类型：
--
作者：
Correia-Ledo, Debby;Gibson, Kirsty F.;Dhawan, Anuj;Couture, Maxime;Vo-Dinh, Tuan;Graham, Duncan;Masson, Jean-Francois
基于纳米三角形或纳米孔阵列的表面等离子体共振（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基片之间的过渡处制造基片的可能性，使它们成为建立结构-性质关系的理想候选者。本工作的特点是近衍射极限的拉曼图像和FDTD模拟的纳米三角形和纳米孔阵列基板，这清楚地表明，这些Sers基板上的热点的本地化的直径/周期性（D/P）的比率显着影响。实验和模拟数据表明，热点位于纳米三角形（D/P = 1），局部SPR的特点。将D/P比降低到0.75-0.7导致纳米孔阵列的产生，这促进了在金属网络上离域的传播表面等离子体（SP）的激发。对于所研究的每个周期（650 nm至1.5 μm）和激发波长（633和785 nm），无论激光激发附近是否存在等离子体激元带，在从纳米三角形到纳米孔的过渡处始终实现最佳Sers强度。进一步降低D/P比导致激发位于纳米孔阵列边缘周围的局部SP，D/P为0.5-0.6，与先前的报道一致。此外，这份手稿提供了第一个证据表明，热点位于孔内的D/P为0.4，与中心是最高的电场和拉曼强度的区域。令人信服的实验证据和时域有限差分模拟提供了对纳米孔阵列作为表面增强Sers和表面等离子体共振传感器的等离子体特性的全面了解，这对于促进此类表面应用的多样性具有重要价值。
The increasing popularity of surface plasmon resonance (SPR) and surface enhanced Raman scattering (SERS) sensor design based on nanotriangle or nanohole 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 FDTD simulations of nanotriangle and nanohole arrays 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 = 1), characteristic of localized SPR. Decreasing the D/P ratio to 0.75-0.7 led to the creation of nanohole 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 μm) 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 nanohole 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 nanohole arrays as SERS and SPR sensors, which is of significant value in advancing the diversity of applications from such surfaces.
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影响因子：
4.4
作者：
Hao, E;Schatz, GC
通讯作者：
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影响因子：
3.3
作者：
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作者：
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作者：
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通讯作者：
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影响因子：
4.2
作者：
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通讯作者：
Masson, Jean-Francois