Abstract:
:In this paper, we present the design, fabrication and optical characterization of computer-generated holograms (CGH) encoding information for light beams carrying orbital angular momentum (OAM). Through the use of a numerical code, based on an iterative Fourier transform algorithm, a phase-only diffractive optical element (PO-DOE) specifically designed for OAM illumination has been computed, fabricated and tested. In order to shape the incident beam into a helicoidal phase profile and generate light carrying phase singularities, a method based on transmission through high-order spiral phase plates (SPPs) has been used. The phase pattern of the designed holographic DOEs has been fabricated using high-resolution Electron-Beam Lithography (EBL) over glass substrates coated with a positive photoresist layer (polymethylmethacrylate). To the best of our knowledge, the present study is the first attempt, in a comprehensive work, to design, fabricate and characterize computer-generated holograms encoding information for structured light carrying OAM and phase singularities. These optical devices appear promising as high-security optical elements for anti-counterfeiting applications.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Ruffato G,Rossi R,Massari M,Mafakheri E,Capaldo P,Romanato Fdoi
10.1038/s41598-017-18147-7subject
Has Abstractpub_date
2017-12-21 00:00:00pages
18011issue
1issn
2045-2322pii
10.1038/s41598-017-18147-7journal_volume
7pub_type
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