Optical limiting in the visible range : Molecular engineering around N4,N4-bis(4-methoxyphenyl)-N4,N4-diphenyl-4,4-diaminobiphenyl - Andraud, Chantal.; Anemian, Remi.; Baldeck, Patrice L.; Kretsch, Kevin.; Morel, Yannick.; Nunzi, Jean-Michel.; Paci, Barbara.