当前，随着信息时代的深度发展，对具有传输信息容量大、处理速度快等优点的光子器件需求日益强烈。表面等离激元光子器件突破了传统光学的衍射极限，在未来光学器件与电子器件集成的技术革新浪潮中具有举足轻重的作用。利用液晶材料独特的物理及光学特性有效调制等离激元信号，可以实现纳米尺度上光子操纵和控制，为发展更小、更快和更高效的纳米光子学器件提供良机，吸引了人们广泛的关注。只有保证液晶分子有序取向才能实现表面等离激元信号的最佳调制。如何在非平面甚至在多数情况下不完全规整的表面等离激元结构上调控与表征液晶分子有序取向是当前科研领域的重大难题。本项目拟利用表面增强拉曼光谱技术强大的拉曼信号增强能力获取液晶分子结构及取向排列的微观特征，进而表征液晶分子取向；通过表面等离激元金属纳米结构设计，调控液晶分子取向排列，对表面等离激元信号进行有效调制，为表面等离激元光子学器件集成和性能优化提供新的理论和方法指导。

With rapid development of the information age, there is ever-growing need for photonic devices that can process the information in a large capacity and high speed. By breaking the optical diffraction limit, plasmonic devices play an essential role in the wave of technological innovations in the future integration of optics and electronics. Liquid crystal materials can efficiently modulate the plasmon resonance based on their unique physical and optical properties, which enables photon manipulation and control at the nanoscale and hence provides opportunities for the development of smaller, faster and more efficient nanophotonic devices. Only with the ordered orientation of the liquid crystal molecules can the optimal modulation of the surface plasmon be achieved. How to control and characterize the alignment of liquid crystal molecules in non-planar and even in irregular surface plasmon nanostructures is a significant problem in current scientific research. This project intends to utilize the strong Raman signal enhancement of surface enhanced Raman spectroscopy to obtain the microscopic features of the liquid crystal molecular structure and alignment, and then characterize the liquid crystal molecular orientation. By means of the rational design of the surface plasmon nanostructure, the alignment of the liquid crystal molecules could be regulated, leading to the effective modulation of surface plasmon signals, which provides theoretical and methodological guidance for the integration and performance optimization of plasmonic devices.