激光与光电子学进展, 2019, 56 (20): 202414, 网络出版: 2019-10-22
基于金属纳米结构非局域与尺寸效应的表面等离激元特性研究 下载: 1566次
Surface Plasmons Based on Nonlocal and Size-Dependent Effects of Metallic Nanoparticles
表面光学 表面等离激元 表面等离子体光子学 有效介质理论 电磁光学 电子能量损失光谱学 surface optics surface plasmon surface plasma photonics effective medium theory electromagnetic optics electron energy loss spectroscopy
摘要
结合流体动力学介电模型以及尺寸依赖介电模型,提出了一种可用于描述金属纳米结构中表面等离激元非局域和尺寸效应的介电理论模型。利用不同介质模型对半径为1~100 nm的银纳米球进行电子能量损失特性和光学特性的仿真对比,结果表明该理论模型可在较大的能量范围(1~5 eV)和尺寸范围(2~200 nm)内,兼容有效地反映出局域、非局域、尺寸、甚至是类量子尺寸等效应对金属纳米结构表面等离激元特性的影响作用。同时,研究结果还有助于理解表面等离激元在纳米尺度上的共振模式、能量分布机理和动态演化机制,为等离激元器件的开发设计提供了参考。
Abstract
Herein, based on the hydrodynamic Drude model and two size-corrective terms derived from the size-dependent dielectric function, a simplified dielectric theoretical model is proposed to describe the nonlocal and size-dependent effects of surface plasmons in metallic nanostructures. Different dielectric models are used to perform numerical simulation comparisons of the electron energy loss spectroscopy and optical responses for silver spherical nanoparticles with different radii of 1-100 nm. Results show that the proposed theoretical model can demonstrate great effectiveness in reflecting the effects of local, nonlocal, size-dependent effects, and even analogous quantum-size responses on the surface plasmon characteristics of metallic nanostructures, energy (1-5 eV), and size (2-200 nm) ranges. Simultaneously, these results are useful in understanding the resonance mode and energy distribution and dynamic evolution mechanisms of surface plasmons, and provide a reference for the development and design of plasmonic elements on the nanometer scale.
黄恺健, 李世雄, 白忠臣, 张正平, 秦水介. 基于金属纳米结构非局域与尺寸效应的表面等离激元特性研究[J]. 激光与光电子学进展, 2019, 56(20): 202414. Kaijian Huang, Shixiong Li, Zhongchen Bai, Zhengping Zhang, Shuijie Qin. Surface Plasmons Based on Nonlocal and Size-Dependent Effects of Metallic Nanoparticles[J]. Laser & Optoelectronics Progress, 2019, 56(20): 202414.