石墨烯及电介质微纳材料光传输与调控研究

发布时间：2018-05-18 14:35

本文选题：表面等离子激元 + 类电磁诱导透明　；参考：《湖南科技大学》2017年硕士论文

【摘要】：随着集成电路的发展,传统光子器件的作用在发展中受到限制,如何做出更小更集成化的电子元器件,是本领域研究的热点。本文采用时域有限差分法(FDTD)进行数值仿真,研究了石墨烯和电介质等微纳材料的光学传输的现象和内在物理机制,探讨了实现其光学特性的方法和调控方式,得到了一些有趣的光学现象,例如类电磁诱导透明,光学双稳态,通过对这些现象的研究,找到一些相应的调控的方式,为新的高效光电器件的设计提供了一些理论指导。本论文主要内容如下:1)研究了双层石墨烯纳米带单个和多个透明度窗口的调谐和机理。通过分析一系列不同宽度的石墨烯纳米薄层的透射光谱,发现石墨烯纳米带数量和尺寸对透明度峰的位置有明显的影响。另外,还发现通过在等离子体结构中加入更多的石墨烯纳米带单元,可以获得多个类电磁诱导透明的光谱响应。基于石墨烯等离激元的类电磁诱导透明为光交换提供了可能。2)探讨了基于微纳金属-克尔介质的MIM波导结构的光学双稳态效应。研究中得到了明显的光学双稳态回路。此外,还发现增加波导和纳米腔之间的耦合距离,改变克尔介质的宽度和厚度,改变等边三角形空腔的高度及波导的折射率可以引起谐振波长的红移和蓝移。研究结果可以应用在高度集成的光学电路中。3)分析了环形介质纳米棒阵列的异常光学反射。研究结果显示共振频率可以通过改变环形介质纳米棒几何参数来调谐,如环形纳米棒阵列的外半径,内半径及入射角等,从而可以为新型光学器件的设计提供了新的调节方式。
[Abstract]:With the development of integrated circuits, the role of traditional photonic devices is limited in the development. How to make smaller and more integrated electronic components is a hot topic in this field. In this paper, the finite difference time-domain (FDTD) method is used to simulate the optical transmission of graphene and dielectric materials, and the internal physical mechanism is studied. The method and control method to realize their optical properties are discussed. Some interesting optical phenomena, such as electromagnetically induced transparency and optical bistability, have been obtained. Through the study of these phenomena, some corresponding regulation methods have been found, which provide some theoretical guidance for the design of new efficient optoelectronic devices. The main contents of this thesis are as follows: 1) the tuning and mechanism of single and multiple transparency windows of double layer graphene nanobelts are studied. By analyzing the transmission spectra of a series of graphene nanocrystals with different widths, it is found that the number and size of graphene nanoribbons have an obvious influence on the position of the transparency peaks. In addition, it is also found that a number of electromagnetically induced transparent spectral responses can be obtained by adding more graphene nanowires into the plasma structure. Electromagnetically induced transparency based on graphene isotherms provides the possibility of optical exchange. 2) the optical bistable effect of MIM waveguide structure based on micro-nanometallic Kerr dielectric is discussed. A clear optical bistable loop is obtained. In addition, it is found that increasing the coupling distance between the waveguide and the nanoscale cavity, changing the width and thickness of the Kerr medium, changing the height of the equilateral triangular cavity and the refractive index of the waveguide can cause the red shift and blue shift of the resonant wavelength. The results can be used in highly integrated optical circuits to analyze the anomalous optical reflection of annular dielectric nanorods arrays. The results show that the resonant frequency can be tuned by changing the geometric parameters of nanorods in annular dielectric, such as the outer radius, internal radius and incident angle of the ring nanorod array, thus providing a new way for the design of new optical devices.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O482.3;TB383.1

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