SiOxC1−xN large-sized nanocrystals in the photoinduced SHG

Abstract Photoinduced second harmonic generation (SHG) has been revealed in SiOCN nanocrystallites incorporated into the oligoetheracrylate photopolymers. Increasing photoinducing Q-switched nitrogen laser pulses ( λ=337 nm ) leads to an increase of the SHG signal. The SHG achieves its maximum at pump photon flux of about 1.83 GW / cm 2 . The maximum photoinduced SHG is achieved for C/N ratio of about 0.92 and is equal to (3.82±0.11) pm/V. Optimal concentration of the embedded SiOCN nanopowders lies between 4.2% and 6.3%. Decreasing temperature favours increase of the SHG. Substantial contribution of nanocrystallite interfaces is expected in observed nonlinear optical phenomena.