Nonlinear optical properties of silver nanoparticles prepared in Ag doped borate glasses

摘要

Nonlinear properties of Li_2B_4O_7:Ag borate glasses with "Li_2B_4O_7:Ag nanoparticles" interface region formed by thermal treatment in hydrogen atmosphere and in vacuum are investigated. From the results of plasmon absorption and normalized transmission measurements in Z-scan regime it was ascertained that "Li_2B_4O_7:AgNPs" interface region changes the character of nonlinear refraction of Li_2B_4O_7:Ag glass from negative to positive, and, due to plasmon resonance, increases significantly its nonlinear properties. In particular, the observed growth of nonlinear refractive index n_2 is more than four orders of magnitude.