【摘要】：近年來,由微納陣列結(jié)構(gòu)構(gòu)成的電磁超表面材料的研究愈來愈熱,主要是其具有等離子體激元(SPP)亞波長超衍射特性。通常,電磁超表面由亞波長周期諧振單元人工構(gòu)建而成二維陣列結(jié)構(gòu),通過借助其表面陣列結(jié)構(gòu)的空間變化的光學響應(yīng),更容易實現(xiàn)特定波段成形、光束分束和偏振轉(zhuǎn)換,這些特性都是天然材料所沒有的超常電磁特性,為操控電磁波提供了全新的技術(shù)途徑,在定向輻射高性能天線、電磁隱身、相控全息、紅外及THz波段功能器件等領(lǐng)域具有重要的應(yīng)用前景。本文主要研究改變正交激光倏逝駐波光場強比例和相位差,改變激光倏逝駐波場局域電場合矢量方向,對納米棒產(chǎn)生非平衡光學扭矩,納米棒局域朝向發(fā)生改變,得到由納米棒陣列結(jié)構(gòu)構(gòu)成的電磁超表面陣列結(jié)構(gòu);研究正交圓偏振激光倏逝駐波光場作用調(diào)控納米棒旋轉(zhuǎn)的過程。首先,通過仿真實驗分別計算一維TE、一維TM倏逝駐波光場強度分布及其對應(yīng)矢量圖分布,可變正交激光倏逝駐波光場強度分布及其對應(yīng)的矢量圖分布;通過改變相位差得到正交圓偏振倏逝駐波光場強度分布和其對應(yīng)的矢量分布圖。其次,在放置納米棒之后,利用仿真實驗計算場強分布和其對應(yīng)的矢量分布圖。論文的主要結(jié)構(gòu)安排如下:第一章:本章對金屬納米陣列構(gòu)成的微納陣列電磁超表面的研究背景和國內(nèi)外研究現(xiàn)狀進行了闡述,進而對選題依據(jù)做出了分析。第二章:該章節(jié)我們主要討論了激光倏逝駐波的形成過程;通過理論推導分析和仿真計算,詳細研究了倏逝駐波的偏振態(tài),會隨入射激光偏振態(tài)的變化而變化。一維激光倏逝駐波光路系統(tǒng)的設(shè)計;利用該光路系統(tǒng)沉積金屬納米結(jié)構(gòu)化陣列。第三章:本章首先理論分析質(zhì)點化的納米棒受光場力;利用FDTD仿真實驗計算一維TE、TM激光倏逝駐波場強分布和二維正交激光倏逝駐波場強分布。通過改變正交激光倏逝駐波場強比和相位差,改變激光倏逝駐波場局域電場合矢量方向。第四章:計算圓偏振光照射金屬納米棒陣列結(jié)構(gòu)場強分布;用TM偏振光照射銀納米棒陣列結(jié)構(gòu),通過改變銀納米棒陣列結(jié)構(gòu)和光源入射角度計算其對應(yīng)的散射譜。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB383.1;TN24

【參考文獻】

相關(guān)碩士學位論文 前1條

1 陳凱;激光倏逝駐波聚焦沉積貴金屬納米陣列結(jié)構(gòu)[D];電子科技大學;2015年

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本文編號：2143487