基于金属微纳结构的石墨烯宽带吸收增强效应理论研究

项目名称： 基于金属微纳结构的石墨烯宽带吸收增强效应理论研究

项目编号： No.11404075

项目类型： 青年科学基金项目

立项/批准年度： 2015

项目学科： 物理学I

项目作者： 孔祥天

作者单位： 国家纳米科学中心

项目金额： 8万元

中文摘要： 目前，对于基于石墨烯的微纳光子学原型器件，实现其实际应用的一个前提条件是有效提高光与石墨烯相互作用强度。鉴于利用超颖材料结构可以灵活高效地调节光波近场散射行为，本项目拟理论探索基于金属微纳结构的石墨烯吸收增强效应。首先，通过有限元算法模拟石墨烯表面附近单个金属微纳结构对石墨烯光吸收率的影响，建立近场电磁能量均匀性改变石墨烯光吸收率的物理模型，并探索金属微纳结构与石墨烯之间电磁能量转移的物理机制。在此基础上，根据变换光学理论，结合有限元电磁模拟，设计适合平面集成的石墨烯表面金属微纳结构，实现对石墨烯光吸收率的宽带增强。本研究有望取得宽带高吸收率石墨烯—金属微纳结构复合体系的一般性设计方法，从而对石墨烯器件的设计与应用提供理论帮助。

中文关键词： 石墨烯；纳米结构；光与物质相互作用；；

英文摘要： Currently, an enhancement of light-graphene interaction is necessary for the real-world applications of the prototype graphene-based micro/nano-photonic devices. Since metamaterial structures can modulate near-field light scattering flexibly and efficiently, in this proposal, we will theoretically explore the enhanced optical absorption of graphene mediated by metallic micro/nano- structures. Firstly, the effects of individual metallic micro/nano-structures in the vicinity of graphene on the optical absorption of graphene will be simulated by the finite element method, in order to establish a theoretical model for graphene optical absorption varying with the inhomogeneity of the near-field distribution of electromagnetic energy, and to explore the energy transfer mechanics between metallic micro/nano-structures and graphene. On this basis, according to transformation optics and finite element electromagnetic simulations, we will design planar-integratable metallic micro/nano-structures on graphene to achieve broadband absorption enhancement. Through this investigation, we expect to obtain a general design method of metallic micro/nano-structures on graphene with broadband high absorption, thus assisting the designs and applications of graphene-based photonic devices.

英文关键词： Graphene；nanostructure；Light-matter interaction；；