Non-linear optical response of metallic and semiconducting nanocrystals in fused silica

Abstract

The linear and nonlinear optical properties of Ge-implanted fused-silica were examined and compared with Au- and Si-implanted samples. Samples as-implanted with 1.0 MeV Ge ions to a fluence of 3×10 17 Ge.cm -2 exhibited relatively large non-linearities, |n 2| ≤5×10 -12 cm 2/W, and fast relaxation times, approx.1ps. In contrast, samples implanted with comparable fluences of Au ions exhibited smaller non-linearities, |n 2| approx.1×10 -13 cm 2/W, and slower response times, ≥ 10ps. The non-linearity for Ge was much larger than that for samples as-implanted with Si. Show more