摘要
偏振门技术已被广泛用来探测上皮生物组织的结构,但组织的光学参量如何影响入射光的偏振态这一问题尚未解决。结合斯托克斯测量系统模型和米氏散射理论,计算分析了散射体分别等效成直径为5.0、9.0μm球形粒子的散射光强分布及偏振度分布,以及线偏振光、圆偏振光入射时大小粒子后向散射光的偏振度光谱。结果表明:无论是小粒子还是大粒子,后向单次散射光均具有很高的偏振性,偏振度光谱对粒子尺寸的变化比较敏感,而当线偏振光入射时,随着粒子平均尺寸的增加,光谱振荡频率及偏振度都将增大。该方法对于早期癌症检测具有潜在应用意义。
Polarization gating has been widely used to probe the structure of superficial biological tissue. However, the effect of the optical properties of tissue on the polarization state has not been well understood. Based on the model of detection system for Stokes vectors and Mie scattering theory, the distribution of scattering light intensity and degree of polarization （DOP） from two kinds of spherical particles with equivalent diameter of 5.0 μm and 9.0 μm were computed and analyzed by means of simulation. Thereafter, their backscattering DOP spectra were also calculated when they are illuminated with linear and circular polarization light. It is shown that single backscattering lights from both small and large particles have higher DOP,but their DOP spectra can sensitively reflect the change of their diameters. When linear polarization light is illuminated, both the oscillation frequency of spectra and the DOP increase with the particle size. It implies that the method has the potential significance for early cancer detection.
出处
《红外与激光工程》
EI
CSCD
北大核心
2009年第3期466-469,475,共5页
Infrared and Laser Engineering
基金
四川省教育厅重大培育项目(2006ZD036)
关键词
偏振度
米氏理论
斯托克斯矢量
散射光
Degree of polarization
Mie theory
Stokes vectors
Scattering light
