Diffraction of an off-axis vector-beam by a tilted aperture. (1st October 2022)

• Record Type: Journal Article
• Authors: Remesh, Ghanasyam; B S, Athira; Gucchait, Shyamal; Banerjee, Ayan; Ghosh, Nirmalya; Dutta Gupta, Subhasish
• Is Part Of: Journal of optics. Volume 24:Number 10(2022)
• Publication Date: 2022-10-01
• Subjects: diffraction -- Fourier optics -- orbital angular momentum of light; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8986/ac8aac
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: Manifestations of orbital angular momentum induced effects in the diffraction of a radially polarized vector beam by an off-axis tilted aperture are studied both experimentally and theoretically. Experiments were carried out to extract the degree of circular polarization, which was shown to be proportional to the on-axis component of the spin angular momentum density. We report a clear separation of the regions of dominance of the right and left circular polarizations associated with positive and negative topological charges respectively, which is reminiscent of the standard vortex-induced transverse shift, albeit in the diffraction scenario. The experimental results are supported by model simulations and the agreement is quite satisfactory. The results are useful to appreciate the orbit-orbit related effects due to unavoidable misalignment problems (especially for vortex beams).