| 张超,段美玲,靳晶晶.随机电磁光束在生物组织中偏振态的变化[J].光电子激光,2017,28(3):340~346 |
| 随机电磁光束在生物组织中偏振态的变化 |
| Changes of the polarization states of random electromagnetic beams in biological tissues |
| 投稿时间：2016-06-01 |
| DOI： |
| 中文关键词: 偏振态 随机电磁高斯-谢尔模型(GSM)光束 生物组织 |
| 英文关键词:polarization states random electromagnetic Gaussian-Schell model (GSM) beams biological tissues |
| 基金项目:国家自然科学基金(61405136,11547194)资助项目 (中北大学 物理系,山西 太原 030051) |
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| 中文摘要: |
| 基于广义惠更斯-菲涅尔原理,以随机电磁高斯- 谢尔模型(GSM)光束作为典型的随机电磁光束,推导了随机电磁GSM 光束在生物组织中交 叉谱密度矩 阵元的解析表达式,并用以研究了其在生物组织中传输时轴上偏振度、方位角和 椭圆率的变化。结果表明,随机电磁GSM光束在生物组织中轴上偏振度、方位 角和椭圆率的变化与折射率结构常数C2n、光束参数(λ,σyy和 σxy)及传输距离z有关； C2n越大,轴上偏振度P极值越小,轴上方位角θ和轴上椭圆率ε极值越大, 且极值对应的传输距离越小；当σxx固定,σxx与σyy差值的绝对值越 大,P、θ和 ε随传输距离的变化率越大；σxy越大,P、θ和ε极值越大；光束在生物组织中 传输时,光的偏振态随传输距离的变化范围是很浅的。 |
| 英文摘要: |
| Based on the extended Huygens-Fresnel principle,taking the random electromagnetic Gaussian Schell-model (GSM) beam as a typical example ,the anal ytical expressions of the cross-spectral density matrix elements for random electromagnetic GSM beam propagating in biological tissues a re derived,and used to study the changes above depend on the refractive index of biological tisses C2n,beam parameters (λ,σyy and σxy) a nd propagation distance z.With increasing the C2n,the extreme value of P will dec rease,θ and ε will increase,and the corresponding propagation distances of the extreme values will decrease.When the σ xx is fixed,the bigger absolute value of the difference between σxx and σyy will result in the quicker fluctuation of P,θ and ε along the propagation distance.Additionally,the bigger the σxy is,the bigger the extreme values of P,θ and ε are.Finally,the change range in the polarization states of the random electromagnetic GSM beam with the prop agation distance is superficial when propagating in biological tissues. |
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