J. Hibino et al., SPIROPYRAN AGGREGATES FOR MULTIPLE OPTICAL MEMORY, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 255, 1994, pp. 243-251
Investigating the aggregate-forming ability of the new synthesized pho
tochromic spiropyrans, we have developed novel five spiropyran aggrega
tes each of which has a sharp absorption band at different wavelength.
We have fabricated a recording medium stacked with the aggregate laye
rs, and confirmed 10-multiple optical memory by means of combining the
multi-frequency recording with the recording by two mutually perpendi
cular linear-polarized lights.