基于柱矢量光束的纵向拉曼信号探测  

Longitudinal Raman signal detection based on cylindrical vector beam

作　　者：徐万祥 林剑 XU Wanxiang;LIN Jian(Institute of Photonic Chips,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光子芯片研究所,上海200093 [2]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2023年第1期25-31,共7页Optical Instruments

基　　金：国家自然科学基金(11874267)。

摘　　要：提出了一种获得径向偏振光中纵向分量激发拉曼信号的方法,用于解决一般偏振拉曼信号无法检测分子取向垂直于样品的问题。首先使用聚焦后的角向偏振光和径向偏振光激发样品,然后用两种激发光产生的拉曼信号进行计算,得到由纯纵向光场激发的拉曼信号。使用Si(001)样品和Si(110)样品验证了该方法的可行性。这对于使用拉曼散射信号测量纵向取向的分子,以及纵向的分子振动模式具有一定意义。A method for achieving the Raman signal excited by the longitudinal component of radially polarized light is proposed in this paper to solve the problem that ordinary polarized Raman signal cannot detect samples with vertical molecular orientation.In this method,the focused azimuthally polarized light and radially polarized light are used to excite the sample,and then the Raman signals generated by the two excitation lights are calculated to obtain the Raman signals excited by the pure longitudinal light field.We use Si(001)samples and Si(110)samples to verify the feasibility of this method.This work has certain significance for measuring longitudinally oriented molecules and longitudinal molecular vibration modes by Raman scattering.

关 键 词：径向偏振光 纵向电场 拉曼信号 

分 类 号：O437[机械工程—光学工程]