Characteristic of Surface Plasmon Resonance Spectrum of Metal Nanosphere-Nanodisc Gap Mode Excited the Radially Polarized Optical Vector Beam
LI Meng-jun1, FANG Hui2*, LI Xiao-ming2, YUAN Xiao-cong2
1. Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China
2. Nanophotonics Research Centre & College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Abstract：This proposesa metal nanostructure composed of a metal nanodisc and a metal nanosphereon top of it, which canbe applied for surface enhanced Raman scattering. Due to the excitation of the breathing mode surface plasmon resonance of the nanodisc, this nanostructure can form a gap mode with efficient longitudinal electric field enhancement under the illumination of a radially polarized vector beam. The simulation based on finite element method is carried out to investigate this gap mode and an electrical filed enhancement of 100 times relative to the valid transverse electrical field is demonstrated. In order to present more clearly the spectrum characteristic and the surface electric field distribution of this new nanostructure, the other structures including a single metal nanodisc, a single metal nanosphere, metal film and a metal nanosphere-on the metal film-are also studied under the same simulation configuration. Since the metal nanosphere can be regarded as the tip of a metal probe, the gap mode proposed here is expected to find application in tip enhanced Raman scattering.
Key words：Micro-nano optics; Metal nanodisc; Surface plasmon resonance; Gap mode
李梦君，方 晖，李小明，袁小聪. 径向偏振光束激发的金属纳米球-纳米圆盘间隙模式等离激元共振光谱特性研究[J]. 光谱学与光谱分析, 2019, 39(01): 8-13.
LI Meng-jun, FANG Hui, LI Xiao-ming, YUAN Xiao-cong. Characteristic of Surface Plasmon Resonance Spectrum of Metal Nanosphere-Nanodisc Gap Mode Excited the Radially Polarized Optical Vector Beam. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2019, 39(01): 8-13.
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