Atharva Paranjape, Shyamal Guchhait, Athira B S and Nirmalya Ghosh
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引用次数: 0
Abstract
Laguerre–Gaussian (LG) beams carrying orbital angular momentum (OAM) have shown promise in deep tissue imaging, medical diagnostics, and optical communication due to their robust propagation properties through scattering media. The insight on the mechanism for stronger survival of OAM carrying beam in tissue-like turbid media is expected to contribute towards a better understanding of light transport in the presence of scattering, as well as guide optimization of the intensity, phase, and polarization structure of light for use in biomedical applications like in tissue imaging. We examine the scattering properties by studying the propagation of polarized vortex beams transmitted through tissue-like turbid scattering media. We demonstrate that the intensity profile has a much more profound effect on depolarization than the phase profile for LG beams. Our results indicate that the observed stronger propagation for the higher-order LG beams is due to a higher anisotropy factor g, as seen by the incident beam. We have performed the degree of polarization measurements for the forward scattered light in the case of both LG beams and perfect vortex beams with varying topological charges. A comparison between the observed depolarization trends for the two classes of OAM-carrying beams suggests that the robust scattering properties of the LG beams originate from the intensity profile while the phase profile does not seem to play a major role in the stronger survival of OAM-carrying beam in turbid media.
携带轨道角动量(OAM)的拉盖尔-高斯(LG)光束因其在散射介质中的强大传播特性,在深部组织成像、医疗诊断和光通信领域大有可为。深入了解携带轨道角动量(OAM)的光束在组织类浑浊介质中更强的生存机制,有望有助于更好地理解散射情况下的光传输,并指导优化光的强度、相位和偏振结构,以用于组织成像等生物医学应用。我们通过研究偏振涡旋光束在组织类浊度散射介质中的传播来检验散射特性。我们证明,对于 LG 光束而言,强度曲线对去极化的影响要比相位曲线大得多。我们的研究结果表明,高阶 LG 光束的强传播是由于入射光束的各向异性因子 g 较高所致。我们对 LG 光束和具有不同拓扑电荷的完美涡旋光束的前向散射光进行了偏振度测量。对两类携带 OAM 的光束所观察到的去极化趋势进行比较后发现,LG 光束的强大散射特性源于其强度曲线,而相位曲线似乎对携带 OAM 的光束在浊介质中更强的生存能力不起主要作用。
期刊介绍:
Published twice-monthly (24 issues per year), Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. The journal also publishes articles dealing with those aspects of spectroscopy, quantum optics and non-linear optics, laser physics, astrophysics, plasma physics, chemical physics, optical cooling and trapping and other investigations where the objects of study are the elementary atomic, ionic or molecular properties of processes.