Linear and nonlinear optical properties of poly(p-phenylenevinylene)-poly(N-vinylpyrrolidone) (PPV-PVP) composites

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Abstract
We show that the chemical and physical environment used to synthesise and process poly(p-phenylenevinylene) (PPV) by the soluble precursor route in the matrix of poly(N-vinylpyrrolidone) (PVP) has a remarkable effect on the effective conjugation length of the resulting polymer, which directly affects the third order nonlinearity. A peculiar bathochromic shift of the position of the PPV absorption maximum, an increase of absorption coefficients and the anisotropy of refractive indices upon conversion have been observed. A large third-order optical nonlinearity (In2I>lO cm2/W) at 800 nm can be achieved in the composites. The nonlinearity of the composites depends on the PPV content and the conversion conditions. The PPV-PVP system is interesting from the point of view of its good waveguiding properties in the thin film planar waveguide structures.

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