物理学报2024，Vol.73Issue(16)：102-109,8.DOI:10.7498/aps.73.20240753
基于二次谐波产生光谱与显微成像的CdS纳米线空间取向研究
Spatial orientation of CdS nanowires based on second harmonic generation spectroscopy and microscopic imaging
摘要
Abstract
The second harmonic generation(SHG),as a nonlinear optical effect,has a wide range of applications in obtaining information such as material composition,structure,and properties due to its good polarization sensitivity.Although SHG spectroscopy or SHG microscopy has been used to explore the precise positioning or tracking of nanowires,there are few reports on the combination of SHG spectroscopy and SHG microscopy to study the structure of nanomaterials and the spatial orientation of crystal axes.In this work,we investigate the spatial orientation and crystal axis orientation of cadmium sulfide(CdS)nanowires by combining SHG spectroscopy and microscopic imaging.Firstly,we experimentally and theoretically study the spectral intensity of the SHG of CdS nanowires with the polarization direction of the incident light based on the all-optical analysis method proposed by the predecessors.We also analyze the influence of the azimuth angle of the crystal axis γ,ω and φ on the pattern of the SHG of CdS nanowires in detail.Secondly,through the mutual verification of theoretical calculations and experimental measurement results,we successfully determine the three axial orientations of a single CdS nanowire.Finally,we also investigate the spatial orientation of a single CdS nanowire by using the polarization-dependent SHG microscopic imaging method.It is shown that different parts of the CdS nanowire have different SHG responses when the polarization is changed.These results provide a new idea and an important reference for studying the application of SHG spectroscopy and microscopic imaging in the research of high-precision spatial positioning of nanomaterials.This study provides important enlightenment for realizing the potential applications of nanomaterials in biomedicine.关键词
二次谐波产生/硫化镉纳米线/偏振/晶体取向Key words
second harmonic generation/CdS nanowire/polarization/crystal orientation引用本文复制引用
任立庆,杨强,姬超燃,池娇,胡云,魏迎春,许金友..基于二次谐波产生光谱与显微成像的CdS纳米线空间取向研究[J].物理学报,2024,73(16):102-109,8.基金项目
国家自然科学基金(批准号:12064046)、陕西省科技资源共享平台项目(批准号:2023-CX-PT-16)和陕西省青年创新团队项目(批准号:23JP202)资助的课题. Project supported by the National Natural Science Foundation of China(Grant No.12064046),the Science and Technology Resources Sharing Platform Project of Shaanxi Province,China(Grant No.2023-CX-PT-16),and the Youth Innovation Team Project of Shaanxi Province,China(Grant No.23JP202). （批准号:12064046）
