部分相干圆刃型位错光束在生物组织中的偏振特性  

Polarization Properties of Partially Coherent Circular Edge Dislocation Beams in Biological Tissue

作　　者：贺改梅 段美玲 殷子昂 单晶 冯姣姣 He Gaimei;Duan Meiling;Yin Ziang;Shan Jing;Feng Jiaojiao(School of Semiconductor and Physics,North University of China,Taiyuan 030051,Shanxi,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：《光学学报》2024年第2期254-263,共10页Acta Optica Sinica

基　　金：国家自然科学基金(12204439)。

摘　　要：以推导的在生物组织中部分相干圆刃型位错光束传输时的交叉谱密度矩阵元,研究了传输中不同光束参数(光束波长λ、位错数目n_(dis)、空间自相关长度σ_(yy))对不同场点之间偏振特性的影响。部分相干圆刃型位错光束波长和位错数目不影响偏振态的初始值,而不同空间自相关长度的光束初始偏振态不同。随着传输距离增加,空间同一点的偏振态经历明显的起伏变化后最终趋于与源处一致,空间不同两点间的偏振态最终趋于一不同于初始值的定值。与远红外光和紫外光相比,可见光和近红外光更适合作为生物医学疾病诊疗的目标光束。位错数目越大,各偏振特征参量极值间距越大。空间自相关长度σ_(yy)与σ_(xx)的相对大小会影响偏振度的大小及变化趋势。Objective Due to the rapid development of laser optics,the application of optical methods in photoacoustics,photoacoustic imaging,biomedicine photonics,and other fields has received widespread attention presently.As is known,it is significant to study the propagation behaviors of lasers in biological tissue to understand the interaction mechanism between the laser and biological tissue.Up to now,a large number of researchers have studied the polarization behavior of laser beams propagating through different media,such as ocean turbulence,atmospheric turbulence,and free space.In addition,the circular edge dislocation beam belongs to a typical singular beam with a circular notch in the transverse plane along the transmission direction,which undergoes aπmutation in the phase across the notch(dislocation line),and the basic research about the polarization state of circular edge dislocation beams in biological tissue transmission has not been reported yet.In order to promote the application of singularity optics in biomedical disease diagnosis and treatment and the development of tissue imaging technology,the basic research on the polarization behavior of circular edge dislocation beams in biological tissue transmission has been studied in this work,and the effects of different beam parameters(wavelength,number of dislocations,and spatial self-correlation length)on the changes in polarization state for different field points have been analyzed and compared in detail.We hope that the obtained results in this work will provide theoretical and experimental guidance for the selection of laser parameters in different applications and enhance the development of tissue imaging technology.Methods By introducing the Schell term,the cross spectral density matrix of partially coherent circular edge dislocation beams is obtained by the field distribution of the circular edge dislocation beams at the source.Based on the generalized Huygens-Fresnel principle,the analytical expression of the cross spectral density matrix element of

关 键 词：生物光学 圆刃型位错光束 偏振度 方位角 椭圆率 生物组织 

分 类 号：O436.3[机械工程—光学工程]