Generation of Tunable Fractional Vector Curvilinear Beams With Controllable Phase Distribution

LETO / LETO-3 Spatial Light Modulators
Higher Order Modes / Optical Vortex / OAM Optical Trapping /-Tweezers
Published on:
Authors: Fengyan Gu, Zhongzheng Gu, Chenliang Chang, Caojin Yuan, Shaotong Feng, Fangjian Xing and Shouping Nie
Abstract:

“An approach to generate the tunable fractional vector curvilinear beams (VCBs) was proposed. The scheme is based on the vector optical field generator (VOFG) system, where the two orthogonal polarized scalar curvilinear beams (SCBs) are generated to be the base vector components, and coaxially superposed by a Ronchi grating. We design a new phase distribution with several loops of 0 to π in order to generate more dark gaps. The phase distribution becomes nonuniform by varying the phase variation rate and the positions of the dark gaps are changed. Using the different parameters of the curves, the fractional VCBs with different shapes are achieved. The two orthogonal polarized SCBs with the opposite topological charges are modulated to perform the beam conversion by a phase-only computer-generated hologram (CGH). Our experimental results comply with the theory and the radial opening of the dark gaps may have some applications for guiding and transporting particles.”

Open Access

Publication: IEEE Photonics Journal
Issue/Year: Volume: 11 Issue: 6 (2019)
DOI: 10.1109/JPHOT.2019.2942041
Link: https://doi.org/10.1109/JPHOT.2019.2942041

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