2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161128We study theoretically the exchange of angular momentum between a photon beam and a plasma vortex, and demonstrate the possible excitation of photon angular momentum states in a plasma. This can be relevant to laboratory and space plasma diagnostics; radio astronomy self-calibration; and generating photon angular momentum beams. A static plasma perturbation with helical structure, and a rotating plasma vortex are studied in detail and a comparison between these two cases, and their relevance to the physical nature of photon OAM, is established.4 pages, submitted to Phys. Rev. LettPlasma PhysicsSpace Physicstext