Colloidal suspensions offer as a promising platform for engineering polarizibilities and realization of large and tunable nonlinearities. Previous studies of Gaussian beams propagation in various colloidal suspensions predicted in a number of remarkable optical phenomena and applications, including initiation and regulation of chemical reactions, sorting different species of nanoparticles and imaging through highly scattering media. As compared to the conventionally used Gaussian beams, optical vortices that are characterized by the doughnut-shaped intensity profile and a helical phase front offer even more degrees of freedom for, in particular, optical trapping or imaging applications. In our earlier work, we predicted, using the linear stability analysis and numerical simulations, that the perturbations with an orbital angular momentum of a particular charge will be amplified and lead to the formation of a necklace beam with a particular number of peaks, or “beads.” Here, we performed detailed experimental studies of such necklace beam formation that show an excellent agreement with the analytical and numerical predictions. This work might bring about new possibilities for dynamic optical manipulation and transmission of light through scattering media as well as formation of complex optical patters in colloids.
Natalia M. Litchinitser, Jingbo Sun, Salih Z. Silahli, Wiktor T. Walasik, and Eric G. Johnson, "Necklace beams in engineered nonlinear media (Conference Presentation)," Proc. SPIE 10346, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV, 103461U (Presented at SPIE Nanoscience + Engineering: August 10, 2017; Published: 29 September 2017); https://doi.org/10.1117/12.2275602.5593124843001.
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