物理学报Issue(23)：1-7,7.DOI:10.7498/aps.63.233301
紧聚焦条件下相干反斯托克斯拉曼散射信号场的矢量分析∗
Vector analysis of the coherent anti-Stokes Raman scattering signals generated under the tightly fo cused condition
摘要
Abstract
In a coherent anti-Stokes Raman scattering (CARS) microscope, when samples with different shapes and dimensions are excitated by collinearly introduced and tightly focused Gaussian beams, the microscopic structure will be determined by the spatial distributions of generated CARS signals. Therefore, we build a theoretical model for CARS signals from spherical sample under the tightly focused condition. The intensity and phase distributions of tightly focused linear polarization Gaussian beams are analyzed with vector wave equations. The vector wave equation of CARS signals is derived from Green’s function. The far-field CARS radiation patterns of spherical scatters with different diameters are simulatively calculated. Theoretical analysis and simulative calculation results show that the intensities of forward and backward CARS signals from the small spherical sampler are similar. The images with high contrast can be obtained by backward detection method from an objective with a high numerical aperture. For big spherical samplers, intensities of CARS signals are greatly increased. The emission direction is mainly concentrated in a spatial angle. The forward CARS signals can be effectively collected by an objective with low numerical aperture.关键词
相干反斯托克斯拉曼散射/矢量波动方程/格林函数/紧聚焦条件Key words
coherent anti-Stokes Raman scattering/vector wave equation/Green’s function/tightly focused conditions引用本文复制引用
李亚晖,梁闰富,邱俊鹏,林子扬,屈军乐,刘立新,尹君,牛憨笨..紧聚焦条件下相干反斯托克斯拉曼散射信号场的矢量分析∗[J].物理学报,2014,(23):1-7,7.基金项目
国家重点基础研究发展计划(批准号:2012CB825802)、国家重大科学仪器设备开发专项(批准号:2012YQ150092)、国家自然科学基金重点项目(批准号:61235012)、国家自然科学基金青年科学基金(批准号:11204226)和陕西省自然科学基础研究计划(批准号:2014JM8324)资助的课题.* Project supported by the National Basic Research Program of China (Grant No.2012CB825802), the Special Funds of the Major Scientific Instruments Equipment Development of China (Grant No.2012YQ150092), the Key Program of the National Natural Science Foundation of China (Grant No.61235012), the Young Scientists Fund of the National Natural Science Foundation of China (Grant No.11204226), and the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No.2014JM8324) （批准号:2012CB825802）
