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A two-photon 3D optical storage system based on a photochromic diarylethene (1,2-bis(2-methylbenzobthiophen-3-yl)hexafluorocyclopentene) and a highly efficient two-photon absorbing fluorescent dye (2,7-bis4-(9,9-didecylfluoren-2-yl)vinylphenylbenzothiazole) is demonstrated. The figure shows two-photon fluorescent readout of data recorded by single-photon excitation. The system is suitable for recording data in thick storage media and providing a non-destructive readout method.
Corredor et al. (Mon,) studied this question.