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In this paper, we present the design, fabrication and opticalcharacterization of computer-generated holograms (CGH) encoding information forlight beams carrying orbital angular momentum (OAM). Through the use of anumerical code, based on an iterative Fourier transform algorithm, a phase-onlydiffractive optical element (PH-DOE) specifically designed for OAM illuminationhas been computed, fabricated and tested. In order to shape the incident beaminto a helicoidal phase profile and generate light carrying phasesingularities, a method based on transmission through high-order spiral phaseplates (SPPs) has been used. The phase pattern of the designed holographic DOEshas been fabricated using high-resolution Electron-Beam Lithography (EBL) overglass substrates coated with a positive photoresist layer(polymethylmethacrylate). To the best of our knowledge, the present study isthe first attempt, in a comprehensive work, to design, fabricate andcharacterize computer-generated holograms encoding information for structuredlight carrying OAM and phase singularities. These optical devices appearpromising as high-security optical elements for anti-counterfeitingapplications.

Design, fabrication and characterization of Computer Generated Holograms for anti-counterfeiting applications using OAM beams as light decoders