State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, P. R. China.
Nanoscale. 2018 Jan 3;10(2):533-537. doi: 10.1039/c7nr07331c.
This paper presents the study of the coupling effects of three dimensional (3D) plasmonic nanostructures templated by Morpho butterfly wings. Different from the random deposition of metallic nanoparticles (NPs) or conformal coating of metallic layers on butterfly wings reported previously, the 3D plasmonic nanostructures studied in this work consist of gold (Au) nanostrips quasi-periodically arranged in 3D, which allows us to investigate the plasmonic coupling effects. Through refractive index (RI) matching, the plasmonic coupling can be differentiated from the optical contribution of butterfly wings. By tuning the deposition thickness of Au from 30 to 90 nm, the plasmonic coupling effects between the 3D Au nanostrips are gradually enhanced. In particular, the near-field coupling results in two resonant modes and enhances the surface-enhanced Raman scattering (SERS) signals.
本文研究了由 Morpho 蝴蝶翅膀模板化的三维 (3D) 等离子体纳米结构的耦合效应。与以前报道的金属纳米粒子 (NPs) 的随机沉积或金属层的保形涂层不同，这项工作中研究的 3D 等离子体纳米结构由金 (Au) 纳米带准周期排列组成，这使得我们能够研究等离子体耦合效应。通过折射率 (RI) 匹配，可以将等离子体耦合与蝴蝶翅膀的光学贡献区分开来。通过将 Au 的沉积厚度从 30nm 调至 90nm，3D Au 纳米带之间的等离子体耦合效应逐渐增强。特别是，近场耦合导致了两个共振模式，并增强了表面增强拉曼散射 (SERS) 信号。
