周期性对SERS精细调谐偶极等离子体结构优化的影响

Henrique Vilhena, S. McMeekin, A. S. Holmes-Smith, G. Sharp, Richard M. De La Rue, N. Johnson
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引用次数: 0

摘要

由等离子体偶极子对组成的纳米天线阵列在表面增强拉曼光谱(SERS)中得到了广泛应用。精细的结构可以有效地转换入射电磁能量来激发分子,并提供增强的检测。然而,这种调优机制也有其缺点。为了防止交叉耦合,必须增加每个单独元件之间的距离。这导致了较低的堆积密度值,当这些结构与通过金属溅射或胶体沉积获得的广泛调谐的粒子聚集体相比时,反过来又导致了总体增强拉曼信号的减少。在这项工作中,我们通过模拟和实验证明,可以通过减少纳米天线阵列在垂直和平行于入射电场方向的方向上的距离来增加反射信号。它显示共振波长在两个不同的光谱方向移位取决于如何减少细胞间的距离。由此产生的位移会降低结构的调谐能力,但也会由于偶极子对的紧密耦合而增加SERS强度。我们相信这些结果将使结构的设计和制造具有更大程度的可调性,以及可以与聚合SERS基板相媲美的整体增强拉曼信号。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of periodicity in the optimization of fine tuned dipolar plasmonic structures for SERS
Arrays of nanoantennas consisting of plasmonic dipole pairs have been widely used in surface-enhanced Raman spectroscopy (SERS). Fine-tuned structures that can efficiently convert incident electromagnetic energy to excite molecules and provide enhanced detection. However, this tuning mechanism also has its disadvantages. In order to prevent the cross coupling, the distance between each individual element must be increased. This leads to low packing density values which in turn results in a reduction of the overall enhanced Raman signal when these structures are compared to broadly tuned aggregates of particles such as those obtained through metal sputtering or colloidal deposition. In this work we demonstrate through simulations and experimental work that it is possible to increase the reflected signal of an array of nanoantennas by reducing the distance between them in the direction both perpendicular and parallel to the orientation of the incident electric field. It is shown the resonant wavelength shifts in two different spectral directions depending in how the intercell distance was reduced. These resultant shifts can reduce the tuning capabilities of the structures but also can increase the SERS intensity due to close coupling of the dipole pairs. We believe that these results will enable the design and fabrication of structures possessing a greater degree of tunability together with an overall enhanced Raman signal that can rival aggregated SERS substrates.
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