摘要
基于广义洛仑兹-米氏理论(GLMT),研究了高斯波束对离心球的纵向辐射俘获力。用积分区域近似法计算波束系数,散射场的展开系数由矢量球面波函数的加法定理并求解边界条件得到。给出了高斯波束对在轴离心球辐射俘获力的计算公式并进行了数值模拟。将离心球退化为同心双层球,对离心球辐射俘获力的公式进行了验证。讨论了离心距对纵向俘获力的影响,也讨论了束腰半径、介质折射率和波长对纵向辐射俘获力的影响。
Axial force exerted on an eccentric sphere by a focused Gaussian beam is studied within the framework of the generalized Lorenz-Mie theory （GLMT）. The beam shape coefficients are calculated by integral localized approximation. The translational addition theorems for spherical vector wave functions and the boundary conditions are used in solving the scattering coefficients. Expression and numerical results of the radiation force for an eccentric sphere are given. By reducing the eccentric sphere to a concentric sphere system, the expression of axial force exerted on an eccentric sphere by a focused Gaussian beam is validated. The effects of distance between centers, beam waist, refractive-index and wavelength on axial radiation force are discussed.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第6期1691-1696,共6页
Acta Optica Sinica
基金
教育部科学技术研究重点项目(106149)资助课题
关键词
电磁散射
辐射俘获力
广义米理论
离心球
electromagnetic scattering
radiation trapping forces
generalized Lorenz-Mie theory
eccentric sphere
