基于表面波全息法的表面等离子体波面控制和器件设计

The wavefront control of surface plasmon polaritons (SPPs) is a basic issue in the theory and technology of plasmonics and holds the key to design novel plasmonic nanostructures and devices. Very recently, the applicant of this project has developed a novel approach called surface wave holography to directly design metal nanostructures with particular morphologies to manipulate the wavefront of SPPs for optical beam shaping, without the need of complicated inverse-problem solution. In this project we will extend and consummate the methodology of this direct-design approach and apply it to general problems of plasmonic wavefront shaping and plasmonic device design. We will use the method to design plasmonic nanostructures and devices that can implement the three principal processes of plasmonic wavefront shaping: (1) High-efficiency coupling and transformation between free-space optical beams and plasmonic waves; (2) Wavefront manipulation and beam shaping of plasmonic wave transporting on metal surface; (3) Wavefront manipulation and beam shaping of free-space optical beam with the aid of plasmonic nanostructures. We will use nanofabrication technology to build these designed plasmonic devices. The project will also combine the three processes of plasmonic wavefront manipulation and explore the methodology and technology for high-performance plasmonic optical-interconnects. The success of this project will offer a fast, easy, and accurate design tool for various plasmonic devices.

表面等离子体的波面控制是表面等离子体光学中一个重要的理论和技术问题，是表面等离子体光学器件研制的重要基础。表面电磁波全息术是项目申请人最近发展的一种利用光学全息的原理设计金属表面微纳结构的形貌，以控制表面等离子体传输波面、实现光束整形的直接方法，避免了复杂的电磁波逆问题求解。本项目将发展和完善表面电磁波全息术的理论体系，应用于广泛意义上的表面等离子体波面调控和器件设计。项目将利用该方法设计并利用纳米加工技术制备表面等离子体微纳结构，以实现表面等离子体波前调控的三个基本过程：(1)自由空间光束与表面等离子体传输模式之间的高效耦合和转化；(2)表面等离子体波在金属表面传输时的波前调控和光束整形；(3)表面等离子体对空间光束的波前调控和光束整形。项目还将综合考虑这三个过程，发展表面等离子体片间光互连的原理和技术。项目的成功将为设计各类表面等离子体光学器件提供简单、快速而精确的方法。

表面等离子体(SPP)的波面控制是表面等离子体光学中一个重要的理论和技术问题，是表面等离子体光学器件研制的重要基础。本项目发展和完善了表面电磁波全息术的理论体系，有效地处理了表面等离激元(SPP)在金属表面传播时的波前变换和模式转换，成功地应用于宽带SPP信号的波前调控。研制成功了近红外波段横纵模式可控的表面等离激元微腔，研究了表面等离激元的三维传输及耦合调控。将为设计各类表面等离子体光学器件提供简单、快速而精确的方法。