表面等离子体激元矢量光场操控是纳米光子学的前沿课题，纳米结构的光波激发及偏振态效应是操控实现的关键因素。本项目拟采用散射显微成像的测量方法开展纳米缝调控表面等离子体激元矢量光场图样的研究。通过L-缝结构激发的等离子体模式和光子模式光波的干涉，获取两模式光波参数和偏振效应，建立描述光波干涉的矢量形式惠更斯-菲涅耳原理。研究圆环纳米缝激发的矢量光场图样及其演化；研究产生亚波长格子的非对称多边形缝设计；通过空间光调制器补偿照明实现特定偏振光场图形的产生；通过小单元缝阵列分布实现面内径向偏振光场图形的操控。本项目的研究对于表面等离子体激元光学操控、亚波长显微、纳米光学器件的设计等有潜在的应用前景。

The study on vector light field manipulations of surface plasmon polariton (SPP) is a frontier topic in nano-photonics. The light wave excitation by nano-structures and its effect in polarization state conversion are the key factors. This project focuses on the manipulations of vector light field patterns of SPP. From the interference patterns of light waves of plasmonc and photonic modes excited by L-shaped nanoslits, the parameters and the polarization effects of waves of both modes can be acquired. We will construct the Huygens-Fresnel principle of vector form to describe the interference of the excited waves. We will study the vector wavefield patterns and their evolutions generated by ring-slits, and the engineering of asymmetric hexagons for optical lattice formations. Using the complementary illuminations with spatial-light-modulator, we plan to realize the manipulations of the polarized specific light field patterns. By arranging the small-slit arrays, we schedule to implement the generation of radially polarized patterns. The work of this project may have potential applications in areas as optical manipulations of SPP, subwavelength microscopy and optical nano-device engineering.