Fig. 3: Multiplexed photoswitchable polyynes.

a General structure of photoswitchable polyyne for vibrational multiplexing. b Chemical structures of eight Carbow-switch with distinct Raman frequencies through end-capping variation, 13C isotope labeling and polyyne elongation. c, d Sixteen normalized SRS spectra of Carbow-switch in both the open (c) and closed forms (d).