石墨烯对电致激发表面等离激元的调制特性研究

项目名称： 石墨烯对电致激发表面等离激元的调制特性研究

项目编号： No.61307065

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 李敬

作者单位： 中国科学院理化技术研究所

项目金额： 28万元

中文摘要： 由于表面等离激元具有比电子快的速度、能突破光学衍射极限的优势，等离激元光子学成为微尺度光子学和纳尺度电子学联系的桥梁。表面等离激元的激发和调制是研究等离激元集成回路需要解决的首要问题。本项目拟通过半导体量子阱和金属的近场耦合作用实现表面等离激元的电致激发；在此基础上耦合石墨烯，利用石墨烯的动态调控特性实现对电致激发表面等离激元的调制作用；通过研究量子阱载流子与表面等离激元、表面等离激元与石墨烯的相互耦合作用，揭示调制过程及物理机制；探索表面等离激元电致激发和电学调制的集成方法。本项目的创新之处在于利用具有动态调控特性的石墨烯调制电致激发表面等离激元，进一步实现表面等离激元电致激发和电学调制的集成。本项目的研究将为有源等离激元器件光子学的实现提供新的思路和方法，对等离激元集成回路的发展起到重要的推动作用。

中文关键词： 表面等离激元；电致激发；近场耦合；石墨烯；调制

英文摘要： Surface plasmon polaritons (SPPs), which are electromagnetic modes confined along metal/dielectric interfaces, have attracted great interests in many application fields, especially plasmonic integrated circuits. The plasmonic circuitry is thought as a promising candidate for future information technology because it can be much faster than its electronic counterpart and break the diffraction-limited size of the photonic circuitry. Because of the momentum mismatch between photon and SPP, specific schemes for momentum matching are needed to couple the light from an independent light source to excite and modulate SPPs. The bulky light sources cannot scale down to nanoscale to be integrated into plasmonic circuits. In addition, the modulation for SPPs is only for one excited by light source, which hinders the integration of plasmonic devices. In this proposal, it is investigated that the electrical SPPs source is based on metal structure hybrid with high gain semiconductor QW material. According to the finite-domain time-difference simulation, the strong near-field coupling of metal/QW heterostructure is designed to get efficient excitation of SPPs. By electrical injection into QW, electron-hole pairs are generated in the QW and coupled into SPPs modes at the metal/semiconductor interface. The physical mechanism of t

英文关键词： surface plasmon polaritons；electrical excitation；near-field coupling；graphene；modulation