混合型光子晶体慢光特性的研究

发布时间：2018-05-02 05:32

本文选题：集成光学 + 慢光　；参考：《北方工业大学》2017年硕士论文

【摘要】：全光网络是未来通信技术发展的趋势,而光缓存是实现全光通信的关键技术,光子晶体具有结构微小、设计灵活、常温运行、光频率可控等特点在实现慢光技术方面有着显著的优势。近年来对传统光子晶体的研究已经日趋成熟,为了在保持较好的慢光特性的同时,进一步降低慢光群速度,新型光子晶体结构逐渐成为研究的热点。本文以光子晶体慢光为课题,研究设计了混合结构光子晶体,对光子晶体的慢光特性以及在光缓存方面的应用展开了深入的研究。首先,本文对光子晶体的发展历史和国内外的研究状况进行了回顾和总结,并且对光子晶体的概念、基本特性、实际应用以及制备方法进行了阐述。为后文提供了理论基础。其次,介绍了慢光的实现原理和生成技术。当分析研究光子晶体慢光的数值方法时,重点介绍了平面波展开法和时域有限差分方法,对于完整二维光子晶体结构,给出两种求解能带分布方法的详细过程。在完整结构光子晶体中引入缺陷,形成线缺陷光波导和耦合腔波导结构,分析了光子晶体结构参数对慢光特性的影响。最后以三角晶格圆形介质柱光子晶体结构为基础,使用圆形散射元和椭圆形散射元进行周期性排列,采用平面波展开法对所设计的耦合腔波导进行仿真分析。结果表明,调整缺陷行椭圆形散射元长轴和短轴的参数有利于慢光性能的优化。研究发现,通过改变微腔周围第一排两种散射元的面积比,能够在保持低色散的同时进一步降低导模的群速度。将所设计的耦合腔应用于光缓存中,分析了它的缓存能力。
[Abstract]:All-optical network is the development trend of communication technology in the future, and optical buffer is the key technology to realize all-optical communication. Photonic crystal has small structure, flexible design and operation at room temperature. The characteristics of controllable optical frequency have significant advantages in the realization of slow light technology. In recent years, the research of traditional photonic crystals has become more and more mature. In order to keep good slow light characteristics and further reduce the slow light group velocity, the new photonic crystal structure has gradually become a hot topic. In this paper, the slow light of photonic crystal is studied and designed. The slow light characteristics of photonic crystal and its application in optical buffer are studied deeply. Firstly, the development history of photonic crystals and the research situation at home and abroad are reviewed and summarized, and the concept, basic characteristics, practical application and preparation methods of photonic crystals are described. It provides a theoretical basis for the following articles. Secondly, the realization principle and generation technology of slow light are introduced. When the numerical method of slow light in photonic crystal is analyzed, the plane wave expansion method and the finite-difference time-domain method are introduced. For the complete two-dimensional photonic crystal structure, the detailed process of solving the energy band distribution method is given. The defects are introduced into the complete photonic crystal to form the linear defect optical waveguide and the coupling cavity waveguide structure. The influence of the photonic crystal structure parameters on the slow light characteristics is analyzed. Finally, based on the photonic crystal structure of circular dielectric cylinder with triangular lattice, the circular scattering elements and elliptical scattering elements are arranged periodically, and the coupled cavity waveguide is simulated by plane wave expansion method. The results show that adjusting the parameters of the long axis and short axis of the elliptical scattering elements is beneficial to the optimization of the slow light performance. It is found that by changing the area ratio of the first row of scattering elements around the microcavity, the group velocity of the guided modes can be further reduced while maintaining low dispersion. The designed coupling cavity is applied to optical buffer, and its cache ability is analyzed.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1;O734

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