Producing single-photon wave packets of the infrared spectrum range with an orbital angular momentum using “vortex” phase platesD.A. Turaykhanov, A.V. Shkalikov, A.A. Kalachev, I.R. Imangulova, N.N. Losevsky, E.V. Razova, S.A. Samagin and S.P. KotovaEPJ Web Conf., 190 (2018) 04025DOI: https://doi.org/10.1051/epjconf/201819004025