Propagation and transmission of optical vortex beams through turbid scattering wall with orbital angular momentums

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 (l s ) of the turbid media, z/l s . The results show that in 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/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.

Correlations in Scattered Phase Singular Beams

“…These beams carry an orbital angular momentum (OAM) of mℏ per photon due to its azimuthal phase, where m is the order or topological charge defined as number of helices completed in one wavelength. The propagation of these light beams through various media such as turbid media [17,18], turbulence atmosphere [19,20], and under water [21,22] have attracted lot of interest in recent days for utilizing them for communication applications [23][24][25][26][27][28][29][30]. The vortices can be generated using computer generated holography [31,32] along with the help of spatial light modulator [33,34], spiral phase plate [35,36], and using an astigmatic mode converter [37].…”