基于波束级数展开的粒子椭圆高斯波束散射特性

基于矢量波函数之间的正交性等,得出了任意电磁波束的零阶场和x,y,z一阶场等粒子散射场的表达式,给出了各阶入射场展开系数与散射场展开系数的通用关系,以椭圆高斯波束为例,研究了椭圆高斯波束中粒子的散射特性,通过仿真分析了波束腰宽、照射距离等对散射特性的影响,验证了本文算法的有效性;研究表明:波束腰宽可以改善粒子的识别性能,波束中的粒子具有较强的前向后向散射特性.方法简单,为研究电磁波束的粒子散射特性探索了新的途径.

Scattering of particles in elliptical Gaussian beam based on beam series exspansion

Based on the orthogonalities among the vector wave function, the expressions of scattering fields for a particle respectively in the zero order field and the first field x, y and z are developed. A general relation between the exspansion coefficients of scattering field and incident field are presented. Taking the elliptical beam as an example, the scattering property of a particle in beam is investigated. The effects induced by the beam waist, irradiating distance etc. on scattering property are simulated and analysed. The validity of the algorithm used is demonstrated. Results show that the beam waist may improve the particle＇s identification property and the grain has a strong scattering both in the foreward and backward directions. The method used is simple and has explored a new way for researching the scattering from particles in electromagnetic beams.