the invention relates to method for rendering sustainable the electromagnetic characteristics of optically active composite materials , said method comprising : a first step of preparing doped organic compounds by mixing at least one type of optically active molecules with a protective material in order to prevent the contact thereof with photodegradation - inducing elements and the migration of the optically active molecules ; a second step of producing optically active nanoparticles including said doped organic compounds ; and a third step of producing optically active composite materials by incorporating the optically active nanoparticles into a polymer matrix .