Polyacetylene chains, nonlinear optical

Nowadays, the relative importance of the vibrational response in linear and nonlinear processes is clear but does depend on the optical frequencies concerned. The results obtained for polyacetylene chains in the static limit are sketched in Fig. 36.24. 

This coherence size directly controls the size-scaling behavior of nonlinear optical response. The calculated first- (a), third- (y) and fifth-order (r) static polarizabilities of polyacetylene chains with up to 200... 

Typical functions of substituted poly acetylenes are based on their (i) high gas permeability and (ii) electronic and photonic properties. The former originates from the rigid main chain and bulky substituents. Though electrical insulators, substituted polyacetylenes are more or less conjugated polymers, and this feature has been utilized to develop their electronic and photonic functions such as photoconductivity, electrochromism, optical nonlinearity and ferromagnetism. 

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