Li Xu, Taflove Allen, Backman Vadim
Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, USA.
Opt Lett. 2005 Apr 15;30(8):902-4. doi: 10.1364/ol.30.000902.
We determine the relationship between the depolarization properties of inhomogeneous particles and the statistical parameters of their internal refractive-index distributions. Our analysis demonstrates that the linear depolarization ratio of backscattered light by an inhomogeneous particle is approximately proportional to both the squared standard deviation and the squared correlation length of the particle's internal refractive-index distribution. We verify this result by conducting rigorous numerical studies using the finite-difference time-domain method. This improved understanding of light depolarization by inhomogeneous structures may enhance polarization-based biomedical optical imaging techniques.
我们确定了非均匀颗粒的去极化特性与其内部折射率分布的统计参数之间的关系。我们的分析表明，非均匀颗粒背向散射光的线性去极化率近似地与颗粒内部折射率分布的标准差平方和相关长度平方成正比。我们使用时域有限差分法进行了严格的数值研究来验证这一结果。对非均匀结构光去极化的这种深入理解可能会增强基于偏振的生物医学光学成像技术。
