微纳阵列结构的激光倏逝波驻波调控组装及光学特性研究
发布时间：2018-07-25 10:12
【摘要】：近年来,由微纳阵列结构构成的电磁超表面材料的研究愈来愈热,主要是其具有等离子体激元(SPP)亚波长超衍射特性。通常,电磁超表面由亚波长周期谐振单元人工构建而成二维阵列结构,通过借助其表面阵列结构的空间变化的光学响应,更容易实现特定波段成形、光束分束和偏振转换,这些特性都是天然材料所没有的超常电磁特性,为操控电磁波提供了全新的技术途径,在定向辐射高性能天线、电磁隐身、相控全息、红外及THz波段功能器件等领域具有重要的应用前景。本文主要研究改变正交激光倏逝驻波光场强比例和相位差,改变激光倏逝驻波场局域电场合矢量方向,对纳米棒产生非平衡光学扭矩,纳米棒局域朝向发生改变,得到由纳米棒阵列结构构成的电磁超表面阵列结构;研究正交圆偏振激光倏逝驻波光场作用调控纳米棒旋转的过程。首先,通过仿真实验分别计算一维TE、一维TM倏逝驻波光场强度分布及其对应矢量图分布,可变正交激光倏逝驻波光场强度分布及其对应的矢量图分布;通过改变相位差得到正交圆偏振倏逝驻波光场强度分布和其对应的矢量分布图。其次,在放置纳米棒之后,利用仿真实验计算场强分布和其对应的矢量分布图。论文的主要结构安排如下:第一章:本章对金属纳米阵列构成的微纳阵列电磁超表面的研究背景和国内外研究现状进行了阐述,进而对选题依据做出了分析。第二章:该章节我们主要讨论了激光倏逝驻波的形成过程;通过理论推导分析和仿真计算,详细研究了倏逝驻波的偏振态,会随入射激光偏振态的变化而变化。一维激光倏逝驻波光路系统的设计;利用该光路系统沉积金属纳米结构化阵列。第三章:本章首先理论分析质点化的纳米棒受光场力;利用FDTD仿真实验计算一维TE、TM激光倏逝驻波场强分布和二维正交激光倏逝驻波场强分布。通过改变正交激光倏逝驻波场强比和相位差,改变激光倏逝驻波场局域电场合矢量方向。第四章:计算圆偏振光照射金属纳米棒阵列结构场强分布;用TM偏振光照射银纳米棒阵列结构,通过改变银纳米棒阵列结构和光源入射角度计算其对应的散射谱。
[Abstract]:In recent years, the study of electromagnetic supersurface materials composed of micro and nano arrays has become more and more popular, mainly because of the subwavelength superdiffraction characteristics of plasma excitators (SPP). In general, the electromagnetic supersurface is constructed manually by subwavelength periodic resonance element into a two-dimensional array structure. With the help of the optical response of the spatial variation of the surface array structure, it is easier to realize the formation of a specific band, beam splitting and polarization conversion. These characteristics are extraordinary electromagnetic properties that are not found in natural materials, and provide a new technical approach for manipulating electromagnetic waves, such as directional radiation high performance antennas, electromagnetic stealth, phase controlled holography, Infrared and THz band functional devices have important application prospects. In this paper, we mainly study how to change the ratio of laser evanescent standing wave intensity and phase difference, change the vector direction of local electric field of laser evanescent standing wave field, produce unbalanced optical torque for nanorods, and change the local orientation of nanorods. The electromagnetic supersurface array structure composed of nanorod arrays is obtained and the process of controlling the rotation of nanorods by the action of the laser evanescent wave field of orthogonal circularly polarized laser is studied. First, the intensity distribution and vector distribution of one-dimensional TE-, 1-D TM evanescent standing wave light field and its corresponding vector diagram are calculated by simulation experiments, and the intensity distribution of variable orthogonal laser evanescent standing wave light field and its corresponding vector distribution are calculated. By changing the phase difference, the intensity distribution and the vector distribution of the evanescent standing wave field of orthogonal circular polarization are obtained. Secondly, after the nanorods are placed, the field intensity distribution and the corresponding vector distribution are calculated by simulation experiments. The main structure of the thesis is as follows: chapter 1: this chapter describes the research background and the domestic and foreign research status of the metal nanoscale array electromagnetic supersurface, and then makes an analysis of the basis of the topic. Chapter 2: in this chapter, we mainly discuss the formation process of laser evanescent standing wave, and study the polarization state of evanescent standing wave in detail by theoretical derivation, analysis and simulation, which will change with the change of incident laser polarization state. The design of one-dimensional laser evanescent standing wave optical system, which is used to deposit metal nanostructured arrays. Chapter 3: in this chapter, the optical field force of the particle nanorods is analyzed theoretically, and the intensity distribution of the evanescent standing wave field and the two-dimensional orthogonal laser evanescent standing wave intensity distribution are calculated by FDTD simulation experiment. The direction of the local electric field vector of the laser evanescent standing wave field is changed by changing the intensity ratio and phase difference of the laser evanescent standing wave field. In chapter 4, the field intensity distribution of metal nanorods array irradiated by circularly polarized light is calculated, and the scattering spectrum of silver nanorod array structure is calculated by changing the structure of silver nanorod array and the incident angle of light source.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.1;TN24
本文编号：2143487
[Abstract]:In recent years, the study of electromagnetic supersurface materials composed of micro and nano arrays has become more and more popular, mainly because of the subwavelength superdiffraction characteristics of plasma excitators (SPP). In general, the electromagnetic supersurface is constructed manually by subwavelength periodic resonance element into a two-dimensional array structure. With the help of the optical response of the spatial variation of the surface array structure, it is easier to realize the formation of a specific band, beam splitting and polarization conversion. These characteristics are extraordinary electromagnetic properties that are not found in natural materials, and provide a new technical approach for manipulating electromagnetic waves, such as directional radiation high performance antennas, electromagnetic stealth, phase controlled holography, Infrared and THz band functional devices have important application prospects. In this paper, we mainly study how to change the ratio of laser evanescent standing wave intensity and phase difference, change the vector direction of local electric field of laser evanescent standing wave field, produce unbalanced optical torque for nanorods, and change the local orientation of nanorods. The electromagnetic supersurface array structure composed of nanorod arrays is obtained and the process of controlling the rotation of nanorods by the action of the laser evanescent wave field of orthogonal circularly polarized laser is studied. First, the intensity distribution and vector distribution of one-dimensional TE-, 1-D TM evanescent standing wave light field and its corresponding vector diagram are calculated by simulation experiments, and the intensity distribution of variable orthogonal laser evanescent standing wave light field and its corresponding vector distribution are calculated. By changing the phase difference, the intensity distribution and the vector distribution of the evanescent standing wave field of orthogonal circular polarization are obtained. Secondly, after the nanorods are placed, the field intensity distribution and the corresponding vector distribution are calculated by simulation experiments. The main structure of the thesis is as follows: chapter 1: this chapter describes the research background and the domestic and foreign research status of the metal nanoscale array electromagnetic supersurface, and then makes an analysis of the basis of the topic. Chapter 2: in this chapter, we mainly discuss the formation process of laser evanescent standing wave, and study the polarization state of evanescent standing wave in detail by theoretical derivation, analysis and simulation, which will change with the change of incident laser polarization state. The design of one-dimensional laser evanescent standing wave optical system, which is used to deposit metal nanostructured arrays. Chapter 3: in this chapter, the optical field force of the particle nanorods is analyzed theoretically, and the intensity distribution of the evanescent standing wave field and the two-dimensional orthogonal laser evanescent standing wave intensity distribution are calculated by FDTD simulation experiment. The direction of the local electric field vector of the laser evanescent standing wave field is changed by changing the intensity ratio and phase difference of the laser evanescent standing wave field. In chapter 4, the field intensity distribution of metal nanorods array irradiated by circularly polarized light is calculated, and the scattering spectrum of silver nanorod array structure is calculated by changing the structure of silver nanorod array and the incident angle of light source.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.1;TN24
【参考文献】
相关硕士学位论文 前1条
1 陈凯;激光倏逝驻波聚焦沉积贵金属纳米阵列结构[D];电子科技大学;2015年
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