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Published online by Cambridge University Press: 15 February 2011
Series of molecules and polymeric systems are being evaluated as optical limiters for the design of a high second molecular hyperpolarizability γ. For example, results for a series of tolanes are discussed, as well as those of semi-flexible, stiff-chain polymers, including substituted biphenyl (X, Y = H, CH3, NO2, or a halogen atom) and benzo-bisthiazole moieties. The non-linear optical response was calculated using a finite field approach and compared for various derivatives.