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-'.
The authors have shown that it is possible to form monolayers of three distinct preformed polymers on Al-Al2O3 substrates. Using gold top electrodes and an annealing technique it is possible to obtain exceptionally stable and resistive films.
Tunnelling currents in stearic acid monolayers stored at 15°C in dry He
have been monitored over an 8 week period. Measurements were made as a function
of both temperature and also applied voltage. It is deduced that the observed currents
are associated with defects which are gradually annealed out.
Recent work on Langmuir films and Langmuir‐Blodgett films prepared from derivatives of styrene‐maleic anhydride and octadec‐1‐ene‐maleic anhydride copolymers is reviewed.
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