Authors: K.J. Plucinski, I.V. Kityk and A. Kassiba
Affilation: Miltary University of Technology, Poland
Pages: 118 - 121
Keywords: SiC nanocrystallites, photoinduced second harmonic generation measurements, molecular dynamic simulation
The influence of the degree of hexagonality on the photoinduced second harmonic generation (PISHG) in SiC large-sized nanocrystallites, with sizes ranging from 10 – 30 nm and incorporated into an oligoetheracrylate photopolymer matrix was investigated. The PISHG measurements were carried out using pulsed YAG:Nd laser (l=1.06 mm, duration time t= 15 - 50 ps, laser power about 30 MW) as probing beam and a Q-switched nitrogen pulse laser (P=10 MW, l=0.377 mm, t=5-15 ps) as photoinducing beam. Molecular dynamics simulations and band structure calculations enabled us to establish the relation between nanocrystallite size, band structure and degree of hexagonality (partial presence of the hexagonal structural component). Quantum chemical simulations of the PISHG versus temperature, pump-probe time delay and degree of hexagonality were carried out.