中文摘要：

圆偏振光较线偏振光具有更多的潜在优势,尤其是在浑浊介质中,利用圆偏振光的旋性进行目标探测可以有效抑制散射光的影响。从经典单粒子偏振态描述方法出发,从散射介质属性和单次散射角大小的角度,阐明了圆偏振光在散射介质中旋性反转与保持的机理,并通过蒙特卡罗方法建模仿真,分析了圆偏振光的后向散射旋性反转特性。仿真结果表明,单次散射后,圆偏振光旋性的保持或反转取决于散射介质的属性及散射角的大小;多次散射后,圆偏振光的旋性保持或反转还和光子入射方向与光子接收面夹角的大小相关。特别地,圆偏振光的后向散射在低浓度散射介质中或短距离传输时会发生旋性反转,而在浑浊介质即高浓度散射介质中或远距离传输时会保持其初始偏振态。

英文摘要：

Compared with the linear polarized light, circularly polarized light has more potential advantages, especially in suppressing the influence of the scattered light when detecting targets in turbid medium using the helicity of circularly polarized light. Based on the description method of classic single-particle polarization state, the helicity reversion and maintenance mechanism of the circularly polarized light is illustrated from the perspectives of scattering medium properties and scattering angle, and the backscattering helicity reversion characteristic of circularly polarized light is analyzed by Monte Carlo simulation method. The simulation results show that the helicity maintenance or reversion after single scattering depends on the properties of scattering medium and the size of scattering angle. After multiple scattering it is also related to the intersection angle between incident photon and photon receiving surface. Specifically the helicity flipping of backscattering circularly polarized light occurs in a low concentration of scattering medium or short distance transmission. But in the turbid medium namely high concentrations of scattering medium or long distance transmission, the helicity maintains its initial polarization state.