Perspectives of optical diagnosis with vector light beams (Conference Presentation)

A. Doronin, N. Vera, J. Staforelli, T. Novikova, I. Meglinski
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引用次数: 3

Abstract

In turbid tissue-like scattering medium the conventional polarized light, scattered multiple number of times, is depolarized, and the depolarization rate depends strongly on the size and shape of scattering particles, as well as on the number of scattering events. In fact, the structure of light can be more complicated when the polarization of light across the laser beam can be radially or azimuthally polarized and carry orbital angular momentum. When these vector light beams, known as cylindrical vector beam (CVB) and Laguerre-Gaussian (LG) beams, propagates in turbid tissue-like scattering medium, either anisotropic or inhomogeneous, the spin or angular momentum are changed that leads to spin-orbit interaction. Such a spin-orbit interaction leads to the mutual influence of the polarization and the trajectory of the light propagation. We investigate the applicability of using CVB and LG beams for optical biopsy. In current presentation propagation of CVB and LG beams in anisotropic turbid tissue-like scattering media is considered in comparison to conventional Gaussian beams. We demonstrate that by applying CVB and LG beams the sensitivity of the conventional polarimetry-based approach is increased at least twice in comparison with the experiments utilizing ‘simple’ Gaussian polarized light. The results of the study suggest that there is a high potential in application of vector light beams in tissue diagnosis.
矢量光束光学诊断的展望(会议报告)
在浑浊类组织散射介质中,经多次散射的常规偏振光发生去极化,其去极化率与散射粒子的大小、形状以及散射事件的次数密切相关。事实上,当穿过激光束的光的偏振可以是径向或方位角偏振并携带轨道角动量时,光的结构可能会更复杂。当这些矢量光束,即圆柱矢量光束(CVB)和拉盖尔-高斯光束(LG),在浑浊的类组织散射介质中传播时,无论是各向异性还是非均匀性,自旋或角动量都会发生变化,从而导致自旋-轨道相互作用。这种自旋轨道相互作用导致偏振和光的传播轨迹的相互影响。我们研究了使用CVB和LG光束进行光学活检的适用性。目前研究了CVB和LG光束在各向异性混浊类组织散射介质中的传播,并与传统高斯光束进行了比较。我们证明,与使用“简单”高斯偏振光的实验相比,使用CVB和LG光束的传统偏振方法的灵敏度至少增加了两倍。研究结果表明,矢量光束在组织诊断中具有很大的应用潜力。
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