新型金屬微納結(jié)構(gòu)的設(shè)計、制備及其應(yīng)用研究
發(fā)布時間：2019-03-25 07:09
【摘要】：金屬微納結(jié)構(gòu)由于其獨特的光學(xué)性質(zhì),引起了國內(nèi)外學(xué)者的研究熱潮。這些結(jié)構(gòu)的光學(xué)性質(zhì)通常都與表面等離激元密切相關(guān),通過對金屬微納結(jié)構(gòu)的適當(dāng)設(shè)計,我們可以在納米尺度上對光學(xué)性質(zhì)進行“修飾”,因此設(shè)計與制備新穎的金屬微納結(jié)構(gòu)具有重大的意義。本文圍繞新型金屬微納結(jié)構(gòu)的設(shè)計、制備及其應(yīng)用展開了深入的研究,論文內(nèi)容主要包括以下兩個方面:一、利用基于有限元方法的Comsol Multiphysics商業(yè)計算軟件,我們理論研究了置于襯底中的金屬納米顆粒構(gòu)成的二維周期性陣列中局域表面等離激元(LSP)共振通過遠場耦合產(chǎn)生的Fano共振現(xiàn)象。研究結(jié)果表明,要實現(xiàn)金屬納米顆粒周期陣列中的Fano共振,必須同時具備以下三個條件:(1)陣列周期產(chǎn)生的衍射表面波與金屬納米顆粒LSP共振的位置要接近;(2)金屬納米顆粒周期陣列必須處于均勻的環(huán)境媒質(zhì)中;(3)衍射表面波與金屬納米顆粒LSP共振這兩種不同線寬的模式必須具有相同的電場分量;當(dāng)Fano共振模被激發(fā)時,其局域電場增強能達到單個納米顆粒LSP共振的110倍。這種雜化Fano共振模具有較窄的帶寬及顯著增強的電場,在高效生物傳感、表面增強拉曼散射、光學(xué)開關(guān)、光學(xué)調(diào)制及非線性光子學(xué)等領(lǐng)域中有著潛在的應(yīng)用前景。二、利用膠體晶體輔助的納米球刻印、反應(yīng)離子刻蝕及磁控濺射技術(shù),我們制備了間距可控的三角金屬納米顆粒周期陣列,對制備的樣品進行了光學(xué)表征,表征結(jié)果顯示隨著反應(yīng)離子刻蝕時間的增加,三角金屬納米顆粒周期陣列中顆粒間的間距會逐漸減小,從而使金屬納米顆粒間的電場得到顯著的增強;進而實驗研究了所制備的不同間距的金屬微納結(jié)構(gòu)的表面增強拉曼散射效應(yīng),實驗結(jié)果表明拉曼信號的增強效果與金屬納米顆粒間的間距大小密切相關(guān),拉曼信號的強度隨著納米顆粒間間距的減少而顯著地增強。我們制備的這種三角金屬納米顆粒周期陣列顆粒間距可調(diào)控、制備面積大,在表面拉曼散射增強領(lǐng)域中有著廣闊的應(yīng)用前景。
[Abstract]:Due to its unique optical properties, metal micro / nano structures have attracted much attention from scholars at home and abroad. The optical properties of these structures are usually closely related to the surface plasmon. Through the proper design of metal micro / nano structures, we can "modify" the optical properties at the nanometer scale. Therefore, it is of great significance to design and fabricate novel metal micro / nano structures. This paper focuses on the design, fabrication and application of new metal micro / nano structures. The main contents of this thesis are as follows: first, the Comsol Multiphysics commercial computing software based on finite element method is used, and the main contents of this paper are as follows: 1. We theoretically study the phenomenon of (LSP) resonance produced by far-field coupling in a two-dimensional periodic array consisting of metal nanoparticles on the substrate. The local surface plasmon Fano resonance is generated by the far-field coupling. The results show that in order to realize the Fano resonance in the periodic array of metal nanoparticles, the following three conditions must be met simultaneously: (1) the position of the diffraction surface wave generated by the array period is close to that of the LSP resonance of the metal nanoparticles; (2) the periodic array of metal nanoparticles must be in uniform environmental medium, (3) the two modes with different linewidth of diffracted surface wave and LSP resonance of metal nanoparticles must have the same electric field component; When the Fano resonance mode is excited, the local electric field enhancement energy is 110 times that of the single nano-particle LSP resonance. The hybrid Fano resonant mode has narrow bandwidth and significantly enhanced electric field, and has potential applications in the fields of high efficiency biosensor, surface-enhanced Raman scattering, optical switch, optical modulation and nonlinear photonics. Secondly, using colloidal crystal assisted nanospheres etching, reactive ion etching and magnetron sputtering techniques, we fabricated periodic arrays of triangular metal nanoparticles with controllable spacing, and the samples were characterized by optics. The characterization results show that with the increase of etching time, the spacing between particles in the periodic array of triangular metal nanoparticles decreases gradually, which makes the electric field between metal nanoparticles significantly enhanced. The surface-enhanced Raman scattering effect of metal micro-nano structures with different spacing has been studied experimentally. The experimental results show that the enhancement effect of Raman signal is closely related to the spacing between metal nanoparticles. The intensity of Raman signal increases significantly with the decrease of the spacing between nanoparticles. The periodic array of triangular metal nanoparticles prepared by us has a wide application prospect in the field of surface Raman scattering enhancement due to its controllable particle spacing and large fabrication area.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1
[Abstract]:Due to its unique optical properties, metal micro / nano structures have attracted much attention from scholars at home and abroad. The optical properties of these structures are usually closely related to the surface plasmon. Through the proper design of metal micro / nano structures, we can "modify" the optical properties at the nanometer scale. Therefore, it is of great significance to design and fabricate novel metal micro / nano structures. This paper focuses on the design, fabrication and application of new metal micro / nano structures. The main contents of this thesis are as follows: first, the Comsol Multiphysics commercial computing software based on finite element method is used, and the main contents of this paper are as follows: 1. We theoretically study the phenomenon of (LSP) resonance produced by far-field coupling in a two-dimensional periodic array consisting of metal nanoparticles on the substrate. The local surface plasmon Fano resonance is generated by the far-field coupling. The results show that in order to realize the Fano resonance in the periodic array of metal nanoparticles, the following three conditions must be met simultaneously: (1) the position of the diffraction surface wave generated by the array period is close to that of the LSP resonance of the metal nanoparticles; (2) the periodic array of metal nanoparticles must be in uniform environmental medium, (3) the two modes with different linewidth of diffracted surface wave and LSP resonance of metal nanoparticles must have the same electric field component; When the Fano resonance mode is excited, the local electric field enhancement energy is 110 times that of the single nano-particle LSP resonance. The hybrid Fano resonant mode has narrow bandwidth and significantly enhanced electric field, and has potential applications in the fields of high efficiency biosensor, surface-enhanced Raman scattering, optical switch, optical modulation and nonlinear photonics. Secondly, using colloidal crystal assisted nanospheres etching, reactive ion etching and magnetron sputtering techniques, we fabricated periodic arrays of triangular metal nanoparticles with controllable spacing, and the samples were characterized by optics. The characterization results show that with the increase of etching time, the spacing between particles in the periodic array of triangular metal nanoparticles decreases gradually, which makes the electric field between metal nanoparticles significantly enhanced. The surface-enhanced Raman scattering effect of metal micro-nano structures with different spacing has been studied experimentally. The experimental results show that the enhancement effect of Raman signal is closely related to the spacing between metal nanoparticles. The intensity of Raman signal increases significantly with the decrease of the spacing between nanoparticles. The periodic array of triangular metal nanoparticles prepared by us has a wide application prospect in the field of surface Raman scattering enhancement due to its controllable particle spacing and large fabrication area.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1
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