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Photochromic Heterocyclic Fulgides. Part 4.' The Thermal and Photochemical Reactions of ( E )lsopropyl idene-[a-(2and -(3-t h ienyl)ethyl idene]succinic Anhydrides and Related Compounds

The third-order optical non-linearity, x ( ~) , linear absorption coefficient, CI, and the ratio of the real to imaginary parts of f 3 ) have been measured at 1.06 pm for a range of nickel dithiolene complexes with absorption bands between 0.77 and 1.06 pm. From these data the non-linear refractive index, n2, and the device-based figure of merit, W ( =Ansat/aA), were calculated. W was found to exceed 2 for materials with absorption maxima below 0.8-0.85 pm. The non-linear refractive index of a poly(methy1 methacrylate) host doped with 8 x 10'' molecules cmP3 of a nickel dithiolene was also measured and found to be nearly 2 x lo-' cm2 kW-'.

Optical data storage, transmission, and handling will require a means to carry out all‐optical switching of information if semiconductor‐based electronics are not to become a serious bottle‐neck for the technology. The various materials which aree being examined wiith a view of this application are reviewed are some recent progress made with metal dithiolene complexes (see figure) described.

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