The orbital angular momentum revolutionized optical communications, like an OAM beam of light need not be interrupted for the transfer ofdata, provides immunity to electromagnetic interference, allows increase bandwidth, rate and transmission capacity information, making theprocess more efficient. Supported by the ability to encode information on OAM modes of light, is necessary the development of a decoder thatintegrate to hardware systems, solve the problem of current techniques, which main disadvantage is to require the use of additional energysources, increasing the implementation cost, and make it less compact. The purpose of this report is towards modelling an optoelectronicdecoder system which discriminates the orbital angular momentum mode in the beam, associated with transmitted information and translates itfrom the selected transmission channel (i.e. outdoor atmosphere) to a recognizable information. Current methodology proposed for thispurpose, integrates the use of thin films of nanometric order, whose design features allows interaction with OAM beams that, can bedistinguish its topological charge.