【摘要】：局域表面等離子體共振(LSPR)作為一種可實現(xiàn)納米尺度光學(xué)調(diào)控的有力工具,可以有效地使空氣中傳播的光波局限于小于衍射極限尺度的空間內(nèi),在結(jié)構(gòu)表面的周圍形成較大的電磁場增強�；诰钟虮砻娴入x子體共振具有突破衍射極限、實現(xiàn)局域場增強和對介電環(huán)境高度敏感等方面的特性,其具有廣泛的應(yīng)用前景。對于復(fù)合貴金屬納米結(jié)構(gòu)而言,其所形成的局域表面等離子體共振的光學(xué)特性與納米結(jié)構(gòu)的各項結(jié)構(gòu)參數(shù)、材料的組合和環(huán)境的介電常數(shù)等有關(guān),具有特殊的光學(xué)性質(zhì),并且內(nèi)部的物理機制也相應(yīng)較為復(fù)雜。本文主要對幾種貴金屬復(fù)合納米結(jié)構(gòu)進行了理論數(shù)值模擬,結(jié)合復(fù)合納米結(jié)構(gòu)參數(shù),利用其消光光譜和等離子體雜化理論對其局域表面等離子體共振特性進行了分析和解釋。本文的主要內(nèi)容如下:第一章,對貴金屬納米結(jié)構(gòu)的LSPR和Fano共振的物理機制、研究進展和主要的研究方法進行了概述,并且簡明地給出了本論文的主要內(nèi)容。第二章,主要研究了非對稱的Fe2O3@Au核殼納米米二聚體的局域表面等離子體共振的光學(xué)特性。研究表明多極等離子體類法諾共振的光譜線形可通過調(diào)控兩個納米米的相對位置得到有效的控制。并進一步給出納米米二聚體的亮暗等離子體模式的相干耦合可獲得強的類法諾窗口,該類法諾共振可在納米米二聚體的兩端和間隙區(qū)域產(chǎn)生巨大的電場增強。第三章,主要研究分析了金納米新月/納米環(huán)復(fù)合結(jié)構(gòu)的LSPR的光學(xué)特性。研究發(fā)現(xiàn)在NCNR結(jié)構(gòu)中獲得了強烈的、分離的多極局域表面等離子體共振峰。通過結(jié)構(gòu)參數(shù)的調(diào)整,可對等離子體共振峰進行有效調(diào)節(jié)。利用等離子體雜化理論,對各個共振峰給出了物理機制解釋。此外研究證明了NCNR結(jié)構(gòu)中的納米新月尖端處引起的巨大電場增強來自于納米環(huán)和納米新月的多極共振模式的耦合作用。第四章,主要研究了非對稱的金納米新月/納米環(huán)復(fù)合結(jié)構(gòu)的LSPP和Fano共振特性。研究表明在不同的非對稱條件下可生成強弱不等的法諾共振強度。通過對消光光譜和電場增強的研究分析,可知這是由于納米新月和納米環(huán)之間的等離子體共振模式耦合作用的強弱變化和生成的共振模式較為特別所造成的。第五章,對本論文所做的工作進行了總結(jié),并對下一步可進行的工作及其潛在應(yīng)用做出了展望。
[Abstract]:As a powerful tool for nanometer scale optical regulation, local surface plasmon resonance (LSPR) can effectively limit the light waves propagated in the air to a space smaller than the diffraction limit scale. A large electromagnetic field is formed around the surface of the structure. Based on the fact that local surface plasmon resonance has the characteristics of breaking through diffraction limit, realizing local field enhancement and highly sensitive to dielectric environment, it has a wide range of application prospects. For the composite precious metal nanostructures, the optical properties of the local surface plasma resonance formed by the nanostructures are related to the structural parameters of the nanostructures, the combination of materials and the dielectric constant of the environment, and have special optical properties. And the internal physical mechanism is also relatively complex. In this paper, the theoretical numerical simulation of several precious metal composite nanostructures is carried out. Combined with the parameters of the composite nanostructures, the local surface plasmon resonance characteristics of the composite nanostructures are analyzed and explained by using their extinction spectra and plasma hybrid theory. The main contents of this paper are as follows: in the first chapter, the physical mechanism, research progress and main research methods of LSPR and Fano resonance of precious metal nanostructures are summarized, and the main contents of this paper are briefly given. In chapter 2, the optical properties of local surface plasma resonance of asymmetric Fe2O3@Au core-shell nanodimer are studied. It is shown that the spectral alignment of multipolar plasma Fano resonance can be effectively controlled by regulating the relative position of two nanometers. Furthermore, it is given that the coherent coupling of the bright and dark plasma mode of the nano-meter dimer can obtain a strong Farno-like window, which can produce a huge electric field enhancement at both ends and the gap region of the nano-meter dimer. In the third chapter, the optical properties of LSPR with gold nano-crescent / nanoring composite structure are studied and analyzed. It is found that a strong, separated multipole local surface plasma resonance peak has been obtained in NCNR structure. The plasma resonance peak can be adjusted effectively by adjusting the structural parameters. Based on the plasma hybrid theory, the physical mechanism of each resonance peak is explained. In addition, it is proved that the huge electric field enhancement caused by the tip of the nano-crescent in the NCNR structure is due to the coupling of the multipole resonance mode between the nanoring and the nano-crescent. In chapter 4, the LSPP and Fano resonance properties of asymmetric gold nanocrescent / nanoring composite structures are studied. It is shown that Farnot resonance intensity with different intensity can be generated under different asymmetric conditions. Through the study and analysis of extinction spectrum and electric field enhancement, it can be seen that this is due to the variation of plasmon resonance mode coupling between nano-crescent and nano-ring and the special resonance mode generated. In the fifth chapter, the work done in this paper is summarized, and the future work and its potential application are prospected.
【學(xué)位授予單位】：寧波大學(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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本文編號：2494626