不对称金属微结构的光学性能调控研究
发布时间：2018-08-04 17:27
【摘要】：受限于光学衍射极限,光子器件在小型化与集成化方面遭遇到前所未有的挑战,而表面等离激元(SPs)的出现为我们解决这一问题提供了有利途径。根据传输性质的不同,表面等离激元可分为表面等离极化激元(SPPs)和局域表面等离激元(LSPs)。通过在不同的金属微结构中激发SPPs或LSPs,不仅可满足当前光子器件对小型化与电光一体化的需求,也可实现许多具有新颖功能的光学效应。本文基于金属微结构器件对SPPs和LSPs的光学性能及其外部调控进行相关理论研究,设计了两种可调控的微结构器件。主要内容有:1.对于传统的光学器件,很难通过简单的光学器件实现圆偏振片的功能。而手性材料由于其结构的特殊性能够获得许多新颖的光学效应,例如:圆二向色性,不对称透射,磁电耦合等。本文依据手性结构对不同圆偏振光的响应不同设计了一种3D金属手性超材料。通过束缚态的电四极子与电偶极子的耦合,实现了亮亮模式的电磁诱导透明现象。此外,通过将手性引入结构,实现了左右旋圆偏振光选择性激发电磁诱导透明现象,进而为纳米量级的圆偏振片的实现提供了理论可能。2.高效的、可集成的等离激元光源在未来的光子集成中将占具很重要的作用,而受限于现有的微加工技术,实验上一直很难加工完成。在这里,结合石墨烯费米能级的可调控特性,本文设计了一种石墨烯加载的不对称金属纳米天线结构,实现了电控表面等离激元(SPPs)单向传输。相较于传统的等离激元单向设备,该设备可以通过微调的方式来弥补实验上的误差。同时还具有宽带宽、单电压调控、易于集成等优点。这种可调谐的等离激元光源将在未来的光子集成与光电子学领域将具有重要的应用价值。3.理论及实验上初步尝试了如何利用SPPs较强的局域场特性实现高调制深度的石墨烯调制器,以及高响应度的SPPs石墨烯探测器。根据石墨烯对SPPs纵向场不吸收而仅吸收横向场的特点,设计了一种波导阵列结构将原有的SPPs场翻转,相较于已有的石墨烯SPPs的调制器,其调制深度提高了一个数量级,最后基于以上分析提出了一种石墨烯光探测结构并对其进行简要的理论分析。
[Abstract]:Due to the limitation of optical diffraction, photonic devices face unprecedented challenges in miniaturization and integration, and the appearance of surface isophosphoric (SPs) provides us with a favorable approach to solve this problem. According to the different transport properties, the surface isophosphors can be divided into (SPPs) and (LSPs). By exciting SPPs or LSPs in different metal microstructures, we can not only meet the demand of miniaturization and electro-optic integration of photonic devices, but also realize many novel optical effects. Based on the theoretical study of the optical properties and external regulation of SPPs and LSPs, two kinds of adjustable microstructural devices are designed in this paper. The main content is: 1. For traditional optical devices, it is difficult to realize the function of circular polarizers by simple optical devices. Because of its special structure, chiral materials can obtain many novel optical effects, such as circular dichroism, asymmetric transmission, magnetoelectric coupling and so on. According to the response of chiral structure to different circular polarized light, a 3D metal chiral supermaterial was designed. The electromagnetically induced transparency in the bright mode is realized by coupling the electric quadrupole and the electric dipole in the bound state. In addition, by introducing chiral structure, the phenomenon of electromagnetically induced transparency induced by left and right rotatory circular polarized light is realized, which provides a theoretical possibility for the realization of nanoscale circular polarizers. The high efficient and integrable isophosphate source will play an important role in the future photon integration. However, limited by the existing micromachining technology, it is always difficult to finish the experiment. Here, considering the controllable characteristics of the graphene Fermi level, an asymmetric metal nanoantenna structure loaded with graphene is designed, and the unidirectional transmission of (SPPs) with electrically controlled surface isophosphoric elements is realized. Compared with the traditional isolator unidirectional equipment, the device can make up the experimental error by fine-tuning. At the same time, it has the advantages of wide band, single voltage regulation, easy integration and so on. This tunable source will have important application value in the field of photonic integration and optoelectronics in the future. In theory and experiment, how to realize the graphene modulator with high modulation depth and the SPPs graphene detector with high responsivity by using the strong local field characteristic of SPPs is preliminarily tried. According to the characteristic that graphene does not absorb the longitudinal field of SPPs but only absorbs the transverse field, a waveguide array structure is designed to flip the original SPPs field. Compared with the existing modulator of graphene SPPs, the modulation depth is increased by an order of magnitude. Finally, based on the above analysis, a structure of graphene photodetection is proposed and briefly analyzed theoretically.
【学位授予单位】：广西师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O613.71;TN15;TN622
本文编号：2164589
[Abstract]:Due to the limitation of optical diffraction, photonic devices face unprecedented challenges in miniaturization and integration, and the appearance of surface isophosphoric (SPs) provides us with a favorable approach to solve this problem. According to the different transport properties, the surface isophosphors can be divided into (SPPs) and (LSPs). By exciting SPPs or LSPs in different metal microstructures, we can not only meet the demand of miniaturization and electro-optic integration of photonic devices, but also realize many novel optical effects. Based on the theoretical study of the optical properties and external regulation of SPPs and LSPs, two kinds of adjustable microstructural devices are designed in this paper. The main content is: 1. For traditional optical devices, it is difficult to realize the function of circular polarizers by simple optical devices. Because of its special structure, chiral materials can obtain many novel optical effects, such as circular dichroism, asymmetric transmission, magnetoelectric coupling and so on. According to the response of chiral structure to different circular polarized light, a 3D metal chiral supermaterial was designed. The electromagnetically induced transparency in the bright mode is realized by coupling the electric quadrupole and the electric dipole in the bound state. In addition, by introducing chiral structure, the phenomenon of electromagnetically induced transparency induced by left and right rotatory circular polarized light is realized, which provides a theoretical possibility for the realization of nanoscale circular polarizers. The high efficient and integrable isophosphate source will play an important role in the future photon integration. However, limited by the existing micromachining technology, it is always difficult to finish the experiment. Here, considering the controllable characteristics of the graphene Fermi level, an asymmetric metal nanoantenna structure loaded with graphene is designed, and the unidirectional transmission of (SPPs) with electrically controlled surface isophosphoric elements is realized. Compared with the traditional isolator unidirectional equipment, the device can make up the experimental error by fine-tuning. At the same time, it has the advantages of wide band, single voltage regulation, easy integration and so on. This tunable source will have important application value in the field of photonic integration and optoelectronics in the future. In theory and experiment, how to realize the graphene modulator with high modulation depth and the SPPs graphene detector with high responsivity by using the strong local field characteristic of SPPs is preliminarily tried. According to the characteristic that graphene does not absorb the longitudinal field of SPPs but only absorbs the transverse field, a waveguide array structure is designed to flip the original SPPs field. Compared with the existing modulator of graphene SPPs, the modulation depth is increased by an order of magnitude. Finally, based on the above analysis, a structure of graphene photodetection is proposed and briefly analyzed theoretically.
【学位授予单位】：广西师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O613.71;TN15;TN622
【参考文献】
相关期刊论文 前1条
1 王振林;;表面等离激元研究新进展[J];物理学进展;2009年03期
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