Optical vortex beam transmission  with different OAM in scattering beads and brain tissue media

W. B. Wang; Lingyan Shi; Lukas Lindwasser; Paulo Marque; M. P. J. Lavery; R. R. Alfano

doi:10.1117/12.2213022

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8 March 2016 Optical vortex beam transmission with different OAM in scattering beads and brain tissue media

W. B. Wang, Lingyan Shi, Lukas Lindwasser, Paulo Marque, M. P. J. Lavery, R. R. Alfano

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Proceedings Volume 9764, Complex Light and Optical Forces X; 976410 (2016) https://doi.org/10.1117/12.2213022
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Light transmission of Laguerre Gaussian (LG) vortex beams with different orbital angular momentum (OAM) values (L) in scattering beads and mouse brain tissue media were experimentally investigated for the first time in comparison with Gaussian (G) beams. The LG beams with different OAM were generated using a spatial light modulator (SLM) in reflection mode. The scattering beads media consist of various sizes and concentrations of latex beads in water solutions. The transmissions of LG and G beams through scattering beads and brain tissue media were measured with different ratios of sample thicknesses (z) to scattering mean free path (l_s) of the turbid media, z/l_s. The results indicate that within the ballistic region where z/l_s is small, the LG and G beams show no significant difference, while in the diffusive region where z/l_s is higher, the vortex beams show higher transmission than G beams. In the diffusive region, the LG beams with higher L values show higher transmission than the beams with lower L values due to the eigen channels in the media. The transition points from the ballistic to diffusive regions for different scattering beads and brain tissue media were studied.

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W. B. Wang, Lingyan Shi, Lukas Lindwasser, Paulo Marque, M. P. J. Lavery, and R. R. Alfano "Optical vortex beam transmission with different OAM in scattering beads and brain tissue media", Proc. SPIE 9764, Complex Light and Optical Forces X, 976410 (8 March 2016); https://doi.org/10.1117/12.2213022

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