偏孔光纤偏振器及其特性研究

项目名称： 偏孔光纤偏振器及其特性研究

项目编号： No.11204047

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 周爱

作者单位： 武汉理工大学

项目金额： 30万元

中文摘要： 本项目将特种结构光纤技术与石墨烯对电磁波的超宽带宽的极化效应相结合，发展一种基于偏孔光纤的超宽带宽石墨烯光纤偏振器。通过在光纤包层靠近纤芯的位置引入一个较大的空气孔，使纤芯与空气孔的界面处具有强的倏逝场，解决了传统光纤偏振器需要对光纤进行侧面抛磨才能获得较强倏逝场的问题。将石墨烯薄层制作于空气孔内壁，利用不同偏振模式在石墨烯中的传输损耗不同这一特性，构建宽带宽石墨烯偏振器。相对于传统基于金属膜或介质膜的光纤偏振器只能有一个偏振态输出、对金属膜或介质膜厚度要求严格、工作带宽窄的特性，石墨烯光纤偏振器可以通过外加电场、磁场或掺杂改变石墨烯的化学势，进而可以选择石墨烯偏振器的输出为TE模或TM模，而且对于石墨烯膜的厚度要求不严格，更重要的是可以实现从可见光到近红外波段的超宽谱偏振调制。本项目的研究工作对于发展超宽带宽的光纤偏振器件和光学器件的微小型化具有重要的科学意义和实用价值。

中文关键词： 石墨烯；光纤；偏振器；；

英文摘要： By combining the special structured optical fiber technology and the ultra-wide bandwidth polarization effect of the graphene, we develop a broadband fiber graphene polarizer based on a side-hollow fiber. By introducing a relative big air hole in the cladding near the core, we can get a strong evanescent wave at the interface between the fiber core and the air, which can solve the problems in traditional fiber polarizers that part of cladding have to be removed by side-polished method to get strong evanescent wave. If a graphene layer is fabricated on the surface of the air hole, a graphene polarizer with broad working band can be obtained owing to the different transmission loss between the two polarization modes that transmitting along the graphene. Comparing to the traditional fiber polarizers based on metal film or dielectric film which only support a unique polarization mode and has a strict demand on the thickness of the film, the output polarization modes of the graphene fiber polarizer can be tuned by applying electric or magnetic field or doping some materials in the graphene. In addition, there is not a strict demand on the thickness of the graphene film for the graphene polarizer. The most important characteristic is that the bandwidth of the graphene polarizer can cover from visible to the near infra

英文关键词： Graphene；Optical fiber；Polarizer；；