Mandelbaum Yaakov, Mottes Raz, Zalevsky Zeev, Zitoun David, Karsenty Avi
Advanced Laboratory of Electro-Optics (ALEO), Department of Applied Physics/Electro-Optics Engineering, Jerusalem College of Technology, Jerusalem 9116001, Israel.
Faculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, Israel.
Nanomaterials (Basel). 2021 Jan 18;11(1):237. doi: 10.3390/nano11010237.
This article, a part of the larger research project of Surface-Enhanced Raman Scattering (SERS), describes an advanced study focusing on the shapes and materials of Tip-Enhanced Raman Scattering (TERS) designated to serve as part of a novel imager device. The initial aim was to define the optimal shape of the "probe": tip or cavity, round or sharp. The investigations focused on the effect of shape (hemi-sphere, hemispheroid, ellipsoidal cavity, ellipsoidal rod, nano-cone), and the effect of material (Ag, Au, Al) on enhancement, as well as the effect of excitation wavelengths on the electric field. Complementary results were collected: numerical simulations consolidated with analytical models, based on solid assumptions. Preliminary experimental results of fabrication and structural characterization are also presented. Thorough analyses were performed around critical parameters, such as the plasmonic metal-Silver, Aluminium or Gold-using Rakic model, the tip geometry-sphere, spheroid, ellipsoid, nano-cone, nano-shell, rod, cavity-and the geometry of the plasmonic array: cross-talk in multiple nanostructures. These combined outcomes result in an optimized TERS design for a large number of applications.
本文是表面增强拉曼散射（SERS）大型研究项目的一部分，描述了一项针对尖端增强拉曼散射（TERS）的形状和材料的深入研究，该研究旨在作为新型成像设备的一部分。最初的目标是确定“探针”的最佳形状：尖端还是腔体，圆形还是尖锐形。研究重点在于形状（半球形、半球体、椭球形腔体、椭球形棒、纳米锥）的影响、材料（银、金、铝）对增强效果的影响，以及激发波长对电场的影响。收集了互补的结果：基于可靠假设，将数值模拟与分析模型相结合。还展示了制造和结构表征的初步实验结果。围绕关键参数进行了深入分析，例如使用拉基奇模型的等离子体金属（银、铝或金）、尖端几何形状（球体、球体、椭球体、纳米锥、纳米壳、棒、腔体）以及等离子体阵列的几何形状：多个纳米结构中的串扰。这些综合结果为大量应用带来了优化的TERS设计。
