Photoinduced Second Harmonic Generation for the In₂O₃ Nanoparticles Embedded into the PMMA Polymers

摘要

PMMA/ In2O3 nanocomposite films for photoinduced nonlinear optics were synthesized. 50% (w/v)solution of PMMA (Mw = 100.000) was prepared in chloroform (purity >99%, from SD FineChemicals, Mumbai) and stirred for ca 15 h. To the viscous solution so obtained, appropriate quantityof In2O3 nanoparticles was added with continuous stirring. The reaction system was sonicated for twohours. The dispersion so obtained was used for formation of PMMA/In2O3 nanocomposite films byspin casting the solution on glass substrate at 10 000 rpm for 20 s. The photoinduced optical secondharmonic generation was performed by nanosecond Nd:YAG laser using the bicolour laser treatment.The output SHG has shown nonlinear dependence on the In2O3 nanoparticles content.