线刃型位错高斯光束在生物组织中偏振态的变化  

Changes of polarization state of linear edge dislocation Gaussian beams in biological tissues

作　　者：殷子昂 段美玲 YIN Ziang;DUAN Meiling(School of Semiconductor and Physics,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学半导体与物理学院,山西太原030051

出　　处：《光学技术》2024年第1期99-105,共7页Optical Technique

基　　金：国家自然科学基金(12204439);山西省高等学校科技创新项目(2020L0300、2020L0277);中北大学校基金资助项目(XJJ201914、XJJ201922)。

摘　　要：基于广义惠更斯-菲涅尔原理,推导了生物组织传输中线刃型位错高斯谢尔模型光束交叉谱密度矩阵元的解析表达式,并比较了不同束腰宽度ω0x、离轴距离d、刃型位错斜率p、空间相关长度σ_(yy)、σ_(xy)对光束轴上偏振度P(0,0,L)、方位角θ(0,0,L)和椭圆率ε(0,0,L)的影响。研究表明,线刃型位错高斯谢尔模型光束ω0x越大,d越大,p越小,P(0,0,L)和ε(0,0,L)变化越大且极值越小。σ_(xy)越大,P(0,0,L)、ε(0,0,L)和θ(0,0,L)的绝对值越大。当σ_(yy)>σxx时,源处θ<0,反之θ>0。σ_(yy)与σxx差值绝对值越小,P(0,0,L)、θ(0,0,L)和ε(0,0,L)的极值越大。随传输距离增大,P(0,0,L)、θ(0,0,L)和ε(0,0,L)最终趋于稳定。Based on the generalized Huygens Fresnel principle,the analytical expression of the cross-spectral density matrix element of the linear edge dislocation Gaussian Schell model beam in biological tissue transmission is derived,and the effects of different waist widthsω_(0x),off axis distances d,edge dislocation slopes p,and spatial correlation lengthsσ_(yy),σ_(xy)on the on-axis polarization degree,azimuth,and ellipticity of the beam will be compared.The results show that the larger the waist widthω_(0x),the larger the off-axis distance d,the smaller the edge dislocation slope p,the larger the change of P(0,0,L)andε(0,0,L)and the smaller the extremum in the linear edge dislocation Gaussian Schell model beam.The greater theσ_(xy),the greater the absolute values of P(0,0,L),θ(0,0,L)andε(0,0,L).Whenσ_(yy)>σ_(xx),θ<0 at the source,whereasσ_(yy)<σ_(xx)corresponds to the opposite one,namely,θ>0 at the source.The smaller the absolute value of the difference betweenσ_(yy)andσ_(xx),the larger the extreme values of P(0,0,L),θ(0,0,L)andε(0,0,L).With increasing the transmission distance,the value of P(0,0,L),θ(0,0,L)andε(0,0,L)tends to be stable eventually,respectively.

关 键 词：物理光学 奇点光学 线刃型位错光束 小鼠真皮组织 偏振态 

分 类 号：O436[机械工程—光学工程]