Evidence for second-order optical nonlinearity in gamma-ray induced partially cross-linked polyacrylonitrile

Article Abstract:

The first direct evidence for second-order nonlinearity in particularly cross-linking polyacrylonitrile, an abundant and flexible material that can be of immense technological interest in fabricating NLO devices is presented. The second harmonic generation (SHG) powder test was employed in order to access the preliminary information about the occurrence of second-order nonlinear effect.

Science & research, Optical properties, Chemical properties

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Ultrafast optical response of carbon films

Article Abstract:

Issues concerning the use of the femtosecond pump-supercontinuum probe technique to study the ultrafast photoinduced optical response of polyacrylonitrile films which have been treated with infrared heat are presented.

Amorphous substances, Pyrolysis, Amorphous materials

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Directed polymers at finite temperatures in 1+1 and 2+1 dimensions

Article Abstract:

Systematic numerical simulations for directed polymers in 1+1 and 2+1 dimensions are presented.

Phase transformations (Statistical physics), Phase transitions (Physics)

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