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Opt Express. 2013 Jul 1;21(13):15755-64. doi: 10.1364/OE.21.015755.

Generation of high-order optical vortices with asymmetrical pinhole plates under plane wave illumination.

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  • 1College of Physics and Electronics, Shandong Normal University, Jinan 250014, China.

Abstract

We propose a novel and simple method for generating optical vortex with high topological charge (TC), merely using an asymmetrical pinhole plate illuminated by plane wave. N pinholes are arranged along a particular spiral line around the plate origin, with constant azimuth angle increment and varied radial distances. The radial differences introduce a constant variation of m/N wavelength to the optical paths from the N pinholes to the observation plane origin, and this increases the phases of the transmitting waves by progressively 2mπ/Nand totally 2mπ. We numerically calculate the transmitted light field according to the Fresnel diffraction theory, and find the vortex with TC m around the observation plane origin. The experimental verifications are performed using some self-made asymmetrical pinhole plates fabricated by a femtosecond laser, with the high TC vortices both generated and detected in a Mach-Zehnder type interferometer. The experimental results coincide with the theoretical simulations well.

PMID:
23842362
[PubMed]
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