The dependence of diffraction efficiency of methylene blue sensitized gelatin gratings us dye concentration is explained in terms of the aggregation state of the dye.
© 1989 Optical Society of America
Nadia Capolla, Christiane Carre, Daniel J. Lougnot, and Roger A. Lessard, "Methylene blue sensitized gelatin: evidence of photodemethylation," Appl. Opt. 28, 4050_1-4052 (1989)