本文選題：六角星型納米顆粒 + 六角花瓣納米顆粒��； 參考：《四川師范大學(xué)》2017年碩士論文

【摘要】：金屬納米顆粒由于其獨特的局域表面等離子體共振(LSPR)性質(zhì),會呈現(xiàn)出一定的消光特性和局域場增強。基于這種性質(zhì),金屬納米顆�？梢员粦�(yīng)用于LSPR傳感、納米波導(dǎo)和表面增強拉曼散射等多個領(lǐng)域。對于LSPR傳感器,其傳感性能主要由品質(zhì)因數(shù)(FOM)體現(xiàn),品質(zhì)因數(shù)越高,傳感性能越好。而品質(zhì)因數(shù)與折射率靈敏度(RIS)和消光光譜的半高全寬(FWHM)直接相關(guān),要得到好的品質(zhì)因數(shù),就要獲得高的折射率靈敏度和窄的半高全寬。影響金屬納米顆粒LSPR性質(zhì)的因素包括材料、尺寸、形狀、排列方式以及周圍介質(zhì)的折射率等。近年來,人們從各個方面研究了金屬納米顆粒的LSPR性質(zhì)和傳感性能。無論是在理論計算上,還是在工藝制備技術(shù)方面都取得了顯著的成果。但實驗條件的限制,導(dǎo)致許多良好的理論成果難以實現(xiàn)。因此,本文在已有實驗結(jié)果的基礎(chǔ)上,提出了一種新型的六角金屬納米顆粒,用CST Microwave Studio仿真軟件對其LSPR性質(zhì)及傳感性能進行研究。論文的主要工作和結(jié)果如下:1.研究頂角角度對六角星型Ag納米顆粒LSPR性質(zhì)和傳感性能的影響。計算結(jié)果表明,當納米顆粒的厚度和橫截面積不變時,頂角角度逐漸從o20增大到o140,消光光譜的峰值波長藍移,消光強度減弱。頂角角度的變化對折射率靈敏度的影響很大,但對消光光譜半高全寬的影響較小。當角度為o30時,折射率靈敏度達最大值1164 nm/RIU,品質(zhì)因數(shù)為9.86 RIU~(-1)。實驗中,經(jīng)常無法達到理想的頂角角度,對于這種鈍化情況,研究發(fā)現(xiàn),隨著頂角鈍化程度的增加,品質(zhì)因數(shù)相應(yīng)減小,傳感性能減弱。2.研究六角花瓣納米顆粒的LSPR性質(zhì)和傳感性能。本論文首先計算了實驗上容易實現(xiàn)的三明治(Ag/Mg F2/Ag)六角花瓣納米顆粒的消光光譜。結(jié)果表明,隨著介質(zhì)層厚度的逐漸增大,短波長共振峰紅移,而長波長共振峰藍移;由上下金屬層之間強烈的近場耦合導(dǎo)致的電場共振逐漸增強,磁場共振逐漸減弱;當介質(zhì)層厚度為80 nm時,納米顆粒的消光光譜只出現(xiàn)一個共振峰,此時半高全寬最小,獲得的折射率靈敏度和品質(zhì)因數(shù)分別為332 nm/RIU和3.91 RIU~(-1)。雖然改變介質(zhì)層厚度可以調(diào)控LSPR光譜的峰值波長,但獲得的傳感性能并不理想。因此,為了獲得更好的品質(zhì)因數(shù),本文計算了單層Ag六角花瓣納米顆粒的消光光譜,并研究了其傳感性能。通過對厚度和幾何尺寸的一系列優(yōu)化,折射率靈敏度能夠達到668 nm/RIU,品質(zhì)因數(shù)約為15 RIU~(-1)。
[Abstract]:Due to its unique local surface plasmon resonance (LSP) properties, metal nanoparticles exhibit a certain extinction characteristic and local field enhancement. Based on this property, metal nanoparticles can be used in many fields such as LSPR sensing, nano-waveguide and surface-enhanced Raman scattering. For the LSPR sensor, the sensing performance is mainly reflected by the quality factor FOM. The higher the quality factor, the better the sensing performance. However, the quality factor is directly related to the refractive index sensitivity (RIS) and the half maximum full width (FWHM) of the extinction spectrum. In order to obtain a good quality factor, a high refractive index sensitivity and a narrow half height full width must be obtained. The factors affecting the LSPR properties of metal nanoparticles include material, size, shape, arrangement and refractive index of surrounding media. In recent years, the LSPR properties and sensing properties of metal nanoparticles have been studied from various aspects. Remarkable achievements have been made in both theoretical calculation and process preparation technology. However, due to the limitation of experimental conditions, many good theoretical results are difficult to achieve. Therefore, based on the experimental results, a novel hexagonal metal nanoparticles is proposed in this paper. The LSPR properties and sensing properties are studied by CST Microwave Studio simulation software. The main work and results are as follows: 1. The effect of vertex angle on LSPR properties and sensing properties of hexagonal Ag nanoparticles was investigated. The calculated results show that when the thickness and cross-sectional area of the nanoparticles are constant, the angle of the peak angle increases from o20 to o140, the peak wavelength of the extinction spectrum shifts blue and the extinction intensity weakens. The change of the angle of the vertex has a great influence on the sensitivity of refractive index, but has little effect on the full width of the extinction spectrum. When the angle is o30, the refractive index sensitivity reaches the maximum value of 1164 nm / r IUU, and the quality factor is 9.86 RIU-1g. In the experiment, the ideal angle can not be achieved. For this passivation, it is found that with the increase of the degree of passivation, the quality factor decreases and the sensing performance weakens. The LSPR properties and sensing properties of hexagonal petal nanoparticles were studied. In this paper, the extinction spectra of hexagonal petal nanoparticles are calculated. The results show that with the increase of the thickness of the dielectric layer, the red shift of the short wavelength resonance peak and the blue shift of the long wavelength resonance peak, the electric field resonance caused by the strong near-field coupling between the upper and lower metal layers increases gradually, and the magnetic resonance gradually weakens. When the thickness of the dielectric layer is 80 nm, there is only one resonance peak in the extinction spectrum of the nanoparticles, and the half-height full width is the smallest, and the refractive index sensitivity and the quality factor are 332 nm / RIU and 3.91 RIU / 1 ~ (-1) respectively. Although the peak wavelength of the LSPR spectrum can be adjusted by changing the thickness of the dielectric layer, the sensing performance is not satisfactory. Therefore, in order to obtain better quality factor, the extinction spectra of monolayer Ag hexagonal petal nanoparticles were calculated and their sensing properties were studied. By optimizing the thickness and geometric size, the refractive index sensitivity can reach 668 nm / r ~ (-1), and the quality factor is about 15 ~ (-1) RIUs.
【學(xué)位授予單位】：四川師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1;O485;TP212

【參考文獻】

相關(guān)期刊論文 前9條

1 彭玲;梅楊;陳淑芬;張玉佩;郝敬昱;鄧玲玲;黃維;;Au nanorods-incorporated plasmonic-enhanced inverted organic solar cells[J];Chinese Physics B;2015年11期

2 龐智;萬玲玉;黃繼欽;歐陽義芳;;金屬納米顆粒的局域表面等離子體共振與面形狀關(guān)系研究[J];光散射學(xué)報;2014年03期

3 包雪峰;;雙金屬納米結(jié)構(gòu)光學(xué)特性分析[J];科技信息;2013年10期

4 曹艷麗;丁孝龍;李紅臣;伊兆廣;王祥夫;朱杰君;闞彩俠;;形貌可控貴金屬納米顆粒的合成、光學(xué)性質(zhì)及生長機制[J];物理化學(xué)學(xué)報;2011年06期

5 倪祖高;馬文英;姚軍;陳科帆;;納米柱陣列傳感器的結(jié)構(gòu)優(yōu)化設(shè)計[J];微納電子技術(shù);2010年12期

6 馬文英;楊歡;劉娟意;倪祖高;唐東升;姚軍;;金屬納米結(jié)構(gòu)的形狀對其消光特性的影響研究[J];光學(xué)學(xué)報;2010年09期

7 馬文英;姚軍;楊歡;劉娟意;;Ag/SiO_2/Ag組成的三角形納米柱的光學(xué)及傳感特性(英文)[J];納米技術(shù)與精密工程;2010年03期

8 黃鵬;付永啟;杜驚雷;周崇喜;羅先剛;;菱形金屬納米粒子光學(xué)性質(zhì)的研究[J];光散射學(xué)報;2009年02期

9 李偉生;;基于FDTD方法的屏蔽機箱電磁泄漏分析[J];四川師范大學(xué)學(xué)報(自然科學(xué)版);2008年04期

相關(guān)博士學(xué)位論文 前2條

1 王長濤;基于表面等離子體的超衍射光傳輸、成像原理和方法研究[D];中國科學(xué)院研究生院（光電技術(shù)研究所）;2013年

2 劉鈺;基于消失場激發(fā)的表面等離子體場增強拉曼散射的研究[D];吉林大學(xué);2011年

相關(guān)碩士學(xué)位論文 前7條

1 劉賢超;透明微球的聚光性質(zhì)及微球陣列光刻的研究[D];四川師范大學(xué);2016年

2 鄭杰;基于雙Bowtie結(jié)構(gòu)的納米直寫光刻聚焦特性研究[D];四川師范大學(xué);2016年

3 李朝;FDTD仿真金屬納米顆粒LSPR特性及在生物光子學(xué)上的應(yīng)用研究[D];華東師范大學(xué);2015年

4 呂厚祥;表面等離子體超分辨光刻成像研究[D];四川師范大學(xué);2014年

5 彭若冰;光波段亞波長結(jié)構(gòu)的輻射特性研究[D];中國科學(xué)院研究生院（光電技術(shù)研究所）;2013年

6 叢超;貴金屬納米顆粒的局域表面等離激元共振特性研究[D];南京大學(xué);2011年

7 李高倩;UC-PBG在微波元件中的應(yīng)用基礎(chǔ)研究[D];山東大學(xué);2008年

，

本文編號：1997806