FIELD: physics, marking.
SUBSTANCE: invention is related to methods for precious items counterfeit protection and may be used for valuables counterfeit protection. At that on precious item passive protective facility is formed with specified structure with application of semiconductor nanostructure with quantum wells, detected informative criterion used is circular photovoltaic effect. Detection is realised by means of analysis of electric response of protective facility at external probing action of electromagnet radiation with further visual and automatic comparison of registered parameters of informative criteria with informative criteria.
EFFECT: increased reliability of counterfeit protection and duplication of valuables.
4 cl, 3 dwg
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