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ICOP & ICPET 2019, 25 - ICOP & ICPET 2019: 241-244 Back to browse issues page
Investigating the propagation of vortex beams in the presence of an opaque obstacle
Seyed mohammad ali Hosseini saber *1, Samira Rezaei2, Ahad Saber1, Ehsan Ahadi akhlaghi1
1- Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran
2- Department of Science, University of Mohaghegh Ardabili, Ardabil, 56199-11367, Iran
Abstract:   (513 Views)

In this article, the propagation of vortex beams in the presence of an opaque obstacle is investigated. The intensity distribution of the diffracted beam due to the edge of the opaque obstacle is simulated using the angular spectrum and Huygens convolution propagation methods. It has been shown that the vortex beams have a relative self-healing property so that the diffracted intensity distribution of these beams are healed asymmetrically through propagation. This phenomenon occurs for a larger topological charge at shorter propagation distances. It has also been shown that the direction of self-healing is related to the topological charge sign, and therefore the use of the diffraction pattern from the edge of the opaque obstacle is a simple and fast way to determine the topological charge sign.

Keywords: vortex beam, diffraction, self-healing, angular spectrum propagation
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Type of Study: Research | Subject: Special
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Hosseini saber S M A, Rezaei S, Saber A, Ahadi akhlaghi E. Investigating the propagation of vortex beams in the presence of an opaque obstacle . ICOP & ICPET. 2019; 25 :241-244
URL: http://opsi.ir/article-1-1908-en.html


Volume 25 - ICOP & ICPET 2019 Back to browse issues page
انجمن اپتیک و فوتونیک ایران Optics and Photonics Society of Iran
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