Spectral features of conjugated bichromophores: porphyrins with curcumin Aleksandr Starukhin, Aleksander Gorski, Tatsiana Pavich and Valerii Kniukshto EPJ Web Conf., 190 (2018) 04023 Published online: 26 September 2018 DOI: 10.1051/epjconf/201819004023