| 吴云光,段美玲,董成伟.随机涡旋光束在生物组织传输中偏振态的变化[J].光电子激光,2018,29(3):340~346 |
| 随机涡旋光束在生物组织传输中偏振态的变化 |
| Changes of the polarization states of random optic vortex beams propagating in b iological tissues |
| 投稿时间：2017-06-14 |
| DOI： |
| 中文关键词: 随机涡旋光束 生物组织 偏振度 方位角 椭圆率 |
| 英文关键词:random optic vortex beam biological tissue degree of polari zation orientation angle ellipticity |
| 基金项目:国家自然科学基金(61405136,11647085)和山西省应用基础研究计划(201701D121011) 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,推导出随机高斯-谢尔模 型(GSM)涡旋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 随机GSM涡旋光束在生物组织传输中的偏振态变化。详细研究了生物组织折射率结 构常数C2n、光束波长λ、空间相关长度σyy和传输距离z对 偏振度P、方位角θ和 椭圆率ε变化的影响。研究表明,λ=10μm的远红外 光束在人体表皮组织传 输中P、θ和ε的值在一段传输距离内几乎不变；λ=0.325μ m的紫外光在传输中,ε的值急剧减小。随着z的增大,C2n越大,即生 物组织湍流越强,P值越小,θ绝对值越大,ε值越大；当z足够大,P、θ和ε在不 同生物组织传输中的值分别趋于一定值。此外,P、θ和ε曲线变化和σyy与σx x的相对大小有关。 |
| 英文摘要: |
| Based on the extended Huygens-Fresnel principle,the analytical expressions of the cross-spectral density matrix elements for random electromagnetic Gaussi an Schell-model (GSM) vortex beam propagating in biological tissues are derived a nd used to study the changes in its polarization state.The detailed investigatio n includes the influence of the structure constant of the refractive-index of biological tissu es C2n, beam parameters (λ and σyy) and propagation distance z on the changes in the deg ree of polarization P,the orientation angle θ and the ellipticity ε.It is shown that the val ues of P,θ and ε are almost un changed at a length of propagation distance for the far infrared beams (λ=10μm) propagating through the biolo gical tissues.The value of ε decreases quickly for ultr aviolet beam (λ=0.325μm).With increasing the propaga tion distance z,the bigger C2n is,the stronger the biological tissue turbulence is,the smaller the value of P is,the bigger the absolute value of θ is,and the bigger the value of ε is.When the propagation distance is sufficiently long ,the values of P,θ and ε tend to a constant in different biological tissues,respectively.Besides, the curve changes of P,θ and ε are also related to the relative magnitude between σyy and σxx. |
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