Resumo

MENDOZA-CASTRO, Jesús H. et al. Data decoding of integer orbital angular momentum beams based in straight edge diffraction nanometric film. Dyna rev.fac.nac.minas [online]. 2019, vol.86, n.209, pp.170-179. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v86n209.74129.

The orbital angular momentum revolutionized optical communications, since an OAM beam of light does not need to be interrupted for the transfer of data, provides immunity to electromagnetic interference, allows increase bandwidth, rate and transmission capacity information. Supported by the ability to encode information on OAM modes of light, methods and developments associated with the formulation and implementation of a data decoding architecture are shown, which uses spatial filters at nanoscale order. An Improvement to techniques for detecting the topological charge of an OAM beam is introduced. Here is reduced to the diffraction of OAM beam by a straight edge and a triangular equilateral aperture analysis; due that the use of additional optics is suppressed which would be necessary for other techniques and decreases the cost of implementation. For this purpose, physics theory of OAM beams, arguments for selecting and design components of the decoder are presented, as well as experimental details, discussions and results, showing the feasibility of the proposed method for decoding information.

Palavras-chave : orbital angular momentum; thin films; encoding; decoding; topological charge; optical communications..

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