Based on the above observations, we conclude that in S/DIB copolymers consisting of short S chains the total Raman spectrum is fully dominated by the Raman activities of the organic molecules. However, in S/DIB copolymers involving longer S chains, Raman activities arising from the symmetric and antisymmetric S-S stretching vibrations in 400-500 cm -1 are found to be present. The observed effect has to do with the fact that polarizability of a typical S-S bond in a short S chain becomes strongly affected by the DIB molecules. As shown in the Supplementary Information, autocorrelation function of an S-S bond polarizability declines much faster in a short S chain due to the presence of DIB molecules than in an isolated S chain of the same length. In S/DIB structures with longer S chains, however, periodic patterns in the time evolution of an S-S bond polarizability are found to be comparable to those in free S chains.