Second-order susceptibility spectra for δ-BiB3O6 polymer nanocomposites deposited on the chalcogenide crystals

• Complex studies of FTIR spectra for δ-BIBO nanoparticle’s embedded films deposited on chalcogenides are done.
• The optimal wavelength for their photo-inducing pumping with respect to the SHG efficiency is about 2900 nm.
• The results are in agreement with quantum chemical calculations.

The optimized conditions for the enhancement of the second harmonic generation in the composites of the orthorhombic δ-BiB3O6:Pr3+ nanoparticles embedded in polyvinyl alcohol films and deposited on the AgGaGe2Se6, AgGaGe2.7Si0.3Se8 (90 mol.% AgGaGe3Se8 – 10 mol.% AgGaSi3Se8), and AgGaGe3Se8:Cu substrates were established. The highest second-order susceptibility was achieved during the Ag–Ga–Ge–Se crystalline substrates photo-illumination by nanosecond laser pulses of about 2900 nm wavelength. The effect was found to be completely reversible after the interruption of the photo-inducing stimulation. Complementary studies of Atomic Force Microscopy, AFM, X-ray Diffraction, XRD, and Fourier-Transform Infrared Spectroscopy, and DFT simulations of spectral dependences of the corresponding second-order nonlinear optical susceptibilities, were performed.

Typical FTIR spectra in reflectance mode from the surface covered with the films. 1 – AgGaGe2Se6, 2 – AgGaGe2Se6, 2 – AgGaGe3Se8:Cu, 90 mol.% AgGaGe3Se8/10 mol.%.Figure optionsDownload as PowerPoint slide