表面等离子体多光束干涉及近场衍射的研究

发布时间：2018-01-11 22:21

本文关键词：表面等离子体多光束干涉及近场衍射的研究　出处：《中国科学院大学(中国科学院长春光学精密机械与物理研究所)》2017年硕士论文　论文类型：学位论文

【摘要】：表面等离子体是入射光与金属表面的自由电子相互耦合而形成的一种表面电磁模.虽然对表面等离子体波的研究已有一百多年的历史,但初期由于受工艺水平限制,难以制备微纳尺度的电子元件,因而表面等离子体波体现不出它的独特性质,不被人们所重视.随着科技的飞速发展,特别是微纳尺寸的电子元件及回路的制作技术日渐成熟,表面等离子体又重新回到了人们的视野.表面等离子体具有短波长,近场增强和表面局域的特性.本论文基于FDTD Solutions软件,对SPP多光束干涉产生的干涉条纹及点阵图样及表面等离子体波在金属表面上的衍射现象做了进一步的研究.在研究SPP波多光束干涉时主要研究的是用金属光栅耦合的方式激发SPP波,在多束SPP波相遇的中央区域内,会产生干涉条纹或干涉点阵图案,其干涉所形成的干涉条纹或点阵图样中携带有超衍射极限的空间频率部分,将其作为显微镜的结构光照明,可突破衍射极限,实现超分辨率成像.本章从产生SPP波的金属光栅材料,结构参数,入射光波长,光源类型等方面出发,研究其对产生的多光束干涉条纹或点阵图样的影响,找出产生最佳SP干涉驻波的光栅结构,作为显微镜的结构照明光源.在研究在金属表面上的衍射现象时主要研究的是SPP波在金属银膜表面近场衍射的现象.由于其隐失场的特性,SPs具有短波长、表面局域及近场增强的特性,这些都与空间光有着很大的区别。但是在近场区域,SPs具有与空间光类似的性质,它们在近场衍射方面有着类似的性质。本章对400-700nm波段的可见光,利用金属光栅耦合方式产生表面等离子体波,然后对其进行多缝的近场衍射模拟,改变衍射光栅的周期及占空比,近场衍射现象会发生变化,当衍射光栅周期约为激发的SPP波的3/2倍时,近场衍射效果最明显,这时衍射光栅可充当分离光谱的作用.
[Abstract]:Surface plasma is a surface electromagnetic mode formed by coupling of incident light and free electron on metal surface. Although the study of surface plasma wave has been more than 100 years. However, due to the limitation of the process level, it is difficult to prepare micro and nano scale electronic components at the initial stage, so the surface plasma wave can not reflect its unique properties and is not paid attention to. With the rapid development of science and technology. Especially, the fabrication technology of micro- and nanoscale electronic components and circuits is maturing day by day, and the surface plasma comes back to the field of vision again. The surface plasma has short wavelength. Near field enhancement and surface localization. This paper is based on FDTD Solutions software. The interference fringes, lattice patterns and diffraction phenomena of surface plasma waves on metal surface produced by SPP multi-beam interference are further studied. In the study of SPP multi-beam interference, gold is mainly used to study. The SPP wave is excited by grating coupling. In the central region where multiple SPP waves meet, interference fringes or interference lattice patterns will be produced, and the interference fringes or lattice patterns will carry the spatial frequency part of the superdiffraction limit in the interference patterns. It can break through the diffraction limit and realize super-resolution imaging. This chapter starts from the aspects of metal grating materials, structure parameters, incident wavelength, light source type and so on. The influence on the multi-beam interference fringes or lattice patterns is studied, and the structure of the gratings producing the best SP interference standing wave is found out. As a structural illumination source of microscope, the diffraction phenomenon of SPP wave on the surface of metal silver film is mainly studied in the study of diffraction phenomenon on the surface of metal, because of its hidden field characteristics. SPs have the characteristics of short wavelength, surface localization and near field enhancement, which are very different from spatial light, but they have similar properties to spatial light in near field. They have similar properties in near-field diffraction. In this chapter, surface plasma waves are generated by metal grating coupling for the visible light at 400-700nm. The near field diffraction phenomenon will change by changing the period and duty cycle of the diffraction grating, when the diffraction grating period is about 3/2 times of the excited SPP wave. The near field diffraction effect is the most obvious, and the diffraction grating can act as the separation spectrum.
【学位授予单位】：中国科学院大学(中国科学院长春光学精密机械与物理研究所)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O436.1

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