Light transmission asymmetry and optical diode Pavel N. Melentiev, Anton E. Afanasiev, Alexey S. Kalmykov and Victor I. Balykin Eur. Phys. J. D, 71 6 (2017) 152 Published online: 13 June 2017 DOI: 10.1140/epjd/e2017-70803-9