贵金属复合纳米结构的LSPR及Fano共振特性的数值研究
发布时间：2019-06-07 07:42
【摘要】：局域表面等离子体共振(LSPR)作为一种可实现纳米尺度光学调控的有力工具,可以有效地使空气中传播的光波局限于小于衍射极限尺度的空间内,在结构表面的周围形成较大的电磁场增强。基于局域表面等离子体共振具有突破衍射极限、实现局域场增强和对介电环境高度敏感等方面的特性,其具有广泛的应用前景。对于复合贵金属纳米结构而言,其所形成的局域表面等离子体共振的光学特性与纳米结构的各项结构参数、材料的组合和环境的介电常数等有关,具有特殊的光学性质,并且内部的物理机制也相应较为复杂。本文主要对几种贵金属复合纳米结构进行了理论数值模拟,结合复合纳米结构参数,利用其消光光谱和等离子体杂化理论对其局域表面等离子体共振特性进行了分析和解释。本文的主要内容如下:第一章,对贵金属纳米结构的LSPR和Fano共振的物理机制、研究进展和主要的研究方法进行了概述,并且简明地给出了本论文的主要内容。第二章,主要研究了非对称的Fe2O3@Au核壳纳米米二聚体的局域表面等离子体共振的光学特性。研究表明多极等离子体类法诺共振的光谱线形可通过调控两个纳米米的相对位置得到有效的控制。并进一步给出纳米米二聚体的亮暗等离子体模式的相干耦合可获得强的类法诺窗口,该类法诺共振可在纳米米二聚体的两端和间隙区域产生巨大的电场增强。第三章,主要研究分析了金纳米新月/纳米环复合结构的LSPR的光学特性。研究发现在NCNR结构中获得了强烈的、分离的多极局域表面等离子体共振峰。通过结构参数的调整,可对等离子体共振峰进行有效调节。利用等离子体杂化理论,对各个共振峰给出了物理机制解释。此外研究证明了NCNR结构中的纳米新月尖端处引起的巨大电场增强来自于纳米环和纳米新月的多极共振模式的耦合作用。第四章,主要研究了非对称的金纳米新月/纳米环复合结构的LSPP和Fano共振特性。研究表明在不同的非对称条件下可生成强弱不等的法诺共振强度。通过对消光光谱和电场增强的研究分析,可知这是由于纳米新月和纳米环之间的等离子体共振模式耦合作用的强弱变化和生成的共振模式较为特别所造成的。第五章,对本论文所做的工作进行了总结,并对下一步可进行的工作及其潜在应用做出了展望。
[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.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
本文编号：2494626
[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.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
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