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11 March 2015 Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums
W. B. Wang, Richard Gozali, Thien An Nguyen, R. R. Alfano
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Proceedings Volume 9318, Optical Biopsy XIII: Toward Real-Time Spectroscopic Imaging and Diagnosis; 931805 (2015) https://doi.org/10.1117/12.2186454
Event: SPIE BiOS, 2015, San Francisco, California, United States
Abstract
Light scattering and transmission of optical Laguerre Gaussian (LG) vortex beams with different orbital angular momentum (OAM) states in turbid scattering media were investigated in comparison with Gaussian (G) beam. The scattering media used in the experiments consist of various sizes and concentrations of latex beads in water solutions. The LG beams were generated using a spatial light modulator in reflection mode. The ballistic transmissions of LG and G beams were measured with different ratios of thickness of samples (z) to scattering mean free path (ls) of the turbid media, z/ls. The results show that in the ballistic region where z/ls is small, the LG and G beams show no significant difference, while in the diffusive region where z/ls is large, LG beams show higher transmission than Gaussian beam. In the diffusive region, the LG beams with higher orbital angular momentum L values show higher transmission than the beams with lower L values. The transition points from ballistic to diffusive regions for different scattering media were studied and determined.
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W. B. Wang, Richard Gozali, Thien An Nguyen, and R. R. Alfano "Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums", Proc. SPIE 9318, Optical Biopsy XIII: Toward Real-Time Spectroscopic Imaging and Diagnosis, 931805 (11 March 2015); https://doi.org/10.1117/12.2186454
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KEYWORDS
Particles
Laser scattering
Scattering
Scattering media
Light scattering
Gaussian beams
Optical vortices
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