石墨烯等离子激元的能带结构和带隙研究

项目名称： 石墨烯等离子激元的能带结构和带隙研究

项目编号： No.11274067

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 资剑

作者单位： 复旦大学

项目金额： 88万元

中文摘要： 最近，石墨烯中的等离子激元受到国际学术界的关注。由于石墨烯电子结构的Dirac锥特性，其支持的等离子激元表现出金属表面所没有独特的性质。石墨烯等离子激元具有深亚波长、高局域性等特性，在纳光学、等离子激元学等领域有重要的应用前景。但一些非常重要的问题还有待解决。例如，如何高效地激发石墨烯等离子激元，这是因为其色散远在光线之下，常规的光激发手段难以实现。另一重要的问题是如何调控其色散。本项目的主要研究即围绕这些基本问题。我们拟首先从理论上研究周期调制下，石墨烯等离子激元的能带结构、带隙特性以及调控机理。周期调制可以通过周期性改变栅压、掺杂或将石墨烯放在周期介质结构上等手段来实现。我们还将研究在周期调制下石墨烯等离子激元的耦合、传播及吸收特性，探索高效激发等离子激元的有效途径，基于特殊能带结构和带隙的新现象和效应，如红外和太赫兹光的超强吸收及探测等。争取与实验合作，验证理论预言。

中文关键词： 石墨烯；等离激元；能带结构；等离激元共振；

英文摘要： Graphene plasmons have received considerable attention in recent years. Due to the existence of Dirac coves in the electronic band structures, graphene plasmons possesses some unique features that do not exist in coventional metallic surfaces. Theoretical and experimental studies show that graphene plasmons have interesting features like deep subwavelength and high localization of fields, and could have potential applications in nanophotonics and plasmonics. However, some important and fundamental questions still remain,e.g., highly efficient excitations of graphene plasmons.This is because graphene plasmons lie far below the light line,nearly impossible for their excitations by conventional methods. Another important issue is how to tailor the dispersion of graphene plasmons. In this proposal, we will tackle these important issues. We will firstly study the band structures and bandgaps of graphene plasmons and their manipulations under periodic modulations, which can be achieved by periodical changes in gate voltages, doping or putting graphene onto periodically structured dielectrics. We will also study the coupling, propagation and absorption of graphene plasmons under periodic modulations, the methods for highly efficient excitations of graphene plasmons, new phenomena resulting from special plasmon band str

英文关键词： graphene；plasmon；band structure；plasmonic resonance；