聚焦部分相干涡旋光束作用于不同折射率瑞利粒子上的辐射力  

Radiation forces of focused partially coherent vortex beam acting on Rayleigh particles with different refractive indices

作　　者：程科[1] 向安平[1] 钟先琼[1] 吕百达[2] 

机构地区：[1]成都信息工程学院光电技术学院,成都610225 [2]四川大学激光物理与化学研究所,成都610064

出　　处：《强激光与粒子束》2011年第2期319-324,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10874125);成都信息工程学院科研基金项目(KYTZ201023)

摘　　要：使用聚焦部分相干高斯谢尔涡旋光束,对不同折射率的瑞利粒子的辐射力做了分析,着重研究了相关长度和束腰宽度对辐射力和俘获稳定性的影响。结果表明:相关长度和束腰宽度分别存在临界值,相干长度小于等于其临界值或束腰宽度大于等于其临界值时,可利用其俘获相对折射率大于1的微粒;而在相关长度大于其临界值或束腰宽度小于其临界值时,可利用其俘获相对折射率小于1的微粒。对俘获稳定性的分析表明,需选择适当的相关长度和束腰宽度才能稳定俘获瑞利粒子。Radiation forces of a focused partially coherent Gaussian Schell-model（GSM） vortex beam used to trap Rayleigh dielectric spherical particles with different refractive indices are analyzed,where the dependence of radiation forces and trapping stability on the correlation length and waist width is stressed and illustrated by numerical examples.There exist critical values for the correlation length and waist width of the GSM vortex beam.The particles with relative refractive index larger than one can be trapped by the beam with waist width less than critical width or correlation length larger than critical length,while the particle with relative refractive index less than one can be trapped by the beam with waist width larger than critical width or correlation length less than critical length.The stability analysis indicates that,by a suitable choice of the correlation length and waist width,stable trapping can be achieved for Rayleigh particles with different refractive indices.

关 键 词：辐射力 部分相干涡旋光束 瑞利粒子 相干长度 束腰宽度 光学俘获 

分 类 号：O439[机械工程—光学工程]